bicameral Congress or Congreso consists of the Senate or Senado (102

seats; members are elected by popular vote to serve four-year terms)

and the House of Representatives or Camara de Representantes (166

seats; members are elected by popular vote to serve four-year terms)

elections: Senate - last held 12 March 2006 (next to be held in

March 2010); House of Representatives - last held 12 March 2006

(next to be held in March 2010)

election results: Senate - percent of vote by party - NA; seats by

party - PSUN 20, PC 18, PL 18, CR 15, PDI 10, other parties 21;

House of Representatives - percent of vote by party - NA; seats by

party - PL 35, PSUN 33, PC 29, CR 20, PDA 8, other parties 41

Judicial branch:

four roughly coequal, supreme judicial organs; Supreme Court of

Justice or Corte Suprema de Justicia (highest court of criminal law;

judges are selected by their peers from the nominees of the Superior

Judicial Council for eight-year terms); Council of State (highest

court of administrative law; judges are selected from the nominees

of the Superior Judicial Council for eight-year terms);

Constitutional Court (guards integrity and supremacy of the

constitution; rules on constitutionality of laws, amendments to the

constitution, and international treaties); Superior Judicial Council

(administers and disciplines the civilian judiciary; resolves

jurisdictional conflicts arising between other courts; members are

elected by three sister courts and Congress for eight-year terms)

Political parties and leaders:

Colombian Conservative Party or PC [Efrain Jose CEPEDA Sarabia];

Alternative Democratic Pole or PDA [Carlos GAVIRIA Diaz]; Liberal

Party or PL [Cesar GAVIRIA Trujillo]; Radical Change or CR [German

VARGAS Lleras]; Social National Unity Party or U Party [Carlos

GARCIA Orjuela]

note: Colombia has 15 formally recognized political parties, and

numerous unofficial parties that did not meet the vote threshold in

the March 2006 legislative elections required for recognition

Political pressure groups and leaders:

National Liberation Army or ELN; Revolutionary Armed Forces of

Colombia or FARC

note: two largest insurgent groups active in Colombia

International organization participation:

BCIE, CAN, Caricom (observer), CDB, FAO, G-3, G-24, G-77, IADB,

IAEA, IBRD, ICAO, ICC, ICCt, ICRM, IDA, IFAD, IFC, IFRCS, IHO, ILO,

IMF, IMO, IMSO, Interpol, IOC, IOM, IPU, ISO, ITSO, ITU, ITUC, LAES,

LAIA, Mercosur (associate), MIGA, NAM, OAS, OPANAL, OPCW, PCA, RG,

UN, UNASUR, UNCTAD, UNESCO, UNHCR, UNIDO, Union Latina, UNWTO, UPU,

WCL, WCO, WFTU, WHO, WIPO, WMO, WTO

Diplomatic representation in the US:

chief of mission: Ambassador Carolina BARCO Isakson

chancery: 2118 Leroy Place NW, Washington, DC 20008

telephone: [1] (202) 387-8338

FAX: [1] (202) 232-8643

consulate(s) general: Atlanta, Boston, Chicago, Houston, Los

Angeles, Miami, New York, San Francisco, San Juan (Puerto Rico),

Washington, DC

Diplomatic representation from the US:

chief of mission: Ambassador William R. BROWNFIELD

embassy: Calle 24 Bis No. 48-50, Bogota, D.C.

mailing address: Carrera 45 No. 24B-27, Bogota, D.C.

telephone: [57] (1) 315-0811

FAX: [57] (1) 315-2197

Flag description:

three horizontal bands of yellow (top, double-width), blue, and red

note: similar to the flag of Ecuador, which is longer and bears the

Ecuadorian coat of arms superimposed in the center

Economy

Colombia

Economy - overview:

Colombia's economy has experienced positive growth over the past

five years despite a serious armed conflict. In fact, 2007 is

regarded by policy makers and the private sector as one of the best

economic years in recent history, after 2005. The economy continues

to improve in part because of austere government budgets, focused

efforts to reduce public debt levels, an export-oriented growth

strategy, improved domestic security, and high commodity prices.

Ongoing economic problems facing President URIBE include reforming

the pension system, reducing high unemployment, and funding new

exploration to offset declining oil production. The government's

economic reforms and democratic security strategy, coupled with

increased investment, have engendered a growing sense of confidence

in the economy. However, the business sector continues to be

concerned about failure of the US Congress to approve the signed FTA.

GDP (purchasing power parity):

$327.7 billion (2007 est.)

GDP (official exchange rate):

$171.6 billion (2007 est.)

GDP - real growth rate:

8.2% (2007 est.)

GDP - per capita (PPP):

$7,400 (2007 est.)

GDP - composition by sector:

agriculture: 11.5%

industry: 36%

services: 52.5% (2007 est.)

Labor force:

20.5 million (2007 est.)

Labor force - by occupation:

agriculture: 22.7%

industry: 18.7%

services: 58.5% (2000 est.)

Unemployment rate:

11.2% (2007 est.)

Population below poverty line:

49.2% (2005)

Household income or consumption by percentage share:

lowest 10%: 7.9%

highest 10%: 34.3% (2004)

Distribution of family income - Gini index:

53.8 (2005)

Investment (gross fixed):

22.5% of GDP (2007 est.)

Budget:

revenues: $63.69 billion

expenditures: $64.96 billion; including capital expenditures of $NA

(2007 est.)

Fiscal year:

calendar year

Public debt:

52.8% of GDP (2007 est.)

Inflation rate (consumer prices):

5.5% (2007 est.)

Central bank discount rate:

11.5% (31 December 2007)

Commercial bank prime lending rate:

15.38% (31 December 2007)

Stock of money:

$21.81 billion (31 December 2007)

Stock of quasi money:

$27.25 billion (31 December 2007)

Stock of domestic credit:

$85.34 billion (31 December 2007)

Agriculture - products:

coffee, cut flowers, bananas, rice, tobacco, corn, sugarcane, cocoa

beans, oilseed, vegetables; forest products; shrimp

Industries:

textiles, food processing, oil, clothing and footwear, beverages,

chemicals, cement; gold, coal, emeralds

Industrial production growth rate:

9.8% (2007 est.)

Electricity - production:

51.83 billion kWh (2006 est.)

Electricity - consumption:

39.58 billion kWh (2006 est.)

Electricity - exports:

876.7 million kWh (2007 est.)

Electricity - imports:

39.4 million kWh (2007 est.)

Electricity - production by source:

fossil fuel: 26%

hydro: 72.7%

nuclear: 0%

other: 1.3% (2001)

Oil - production:

550,000 bbl/day (2008 est.)

Oil - consumption:

265,400 bbl/day (2006 est.)

Oil - exports:

276,100 bbl/day (2005)

Oil - imports:

12,480 bbl/day (2005)

Oil - proved reserves:

1.506 billion bbl (1 January 2008 est.)

Natural gas - production:

7.22 billion cu m (2006 est.)

Natural gas - consumption:

7.22 billion cu m (2006 est.)

Natural gas - exports:

0 cu m (2007 est.)

Natural gas - imports:

0 cu m (2007 est.)

Natural gas - proved reserves:

122.9 billion cu m (1 January 2008 est.)

Current account balance:

-$5.862 billion (2007 est.)

Exports:

$30.58 billion f.o.b. (2007 est.)

Exports - commodities:

petroleum, coffee, coal, nickel, emeralds, apparel, bananas, cut

flowers

Exports - partners:

US 35.4%, Venezuela 17.4%, Ecuador 4.3% (2007)

Imports:

$31.17 billion f.o.b. (2007 est.)

Imports - commodities:

industrial equipment, transportation equipment, consumer goods,

chemicals, paper products, fuels, electricity

Imports - partners:

US 26.2%, China 10.1%, Mexico 9.3%, Brazil 7.3%, Venezuela 4.2%

(2007)

Economic aid - recipient:

$511.1 million (2005)

Reserves of foreign exchange and gold:

$20.95 billion (31 December 2007 est.)

Debt - external:

$41.39 billion (30 June 2007)

Stock of direct foreign investment - at home:

$56.19 billion (2007 est.)

Stock of direct foreign investment - abroad:

$10.38 billion (2007 est.)

Market value of publicly traded shares:

$56.2 billion (2006)

Currency (code):

Colombian peso (COP)

Currency code:

COP

Exchange rates:

Colombian pesos (COP) per US dollar - 2,013.8 (2007), 2,358.6

(2006), 2,320.75 (2005), 2,628.61 (2004), 2,877.65 (2003)

Communications

Colombia

Telephones - main lines in use:

7.936 million (2007)

Telephones - mobile cellular:

33.941 million (2007)

Telephone system:

general assessment: modern system in many respects;

telecommunications sector liberalized during the 1990s; multiple

providers of both fixed-line and mobile-cellular services;

fixed-line connections stand at about 18 per 100 persons; mobile

cellular usage is about 75 per 100 persons; competition among

cellular service providers is resulting in falling local and

international calling rates and contributing to the steep decline in

the market share of fixed line services

domestic: nationwide microwave radio relay system; domestic

satellite system with 41 earth stations; fiber-optic network linking

50 cities

international: country code - 57; submarine cables provide links to

the US, parts of the Caribbean, and Central and South America;

satellite earth stations - 10 (6 Intelsat, 1 Inmarsat, 3 fully

digitalized international switching centers) (2007)

Radio broadcast stations:

AM 454, FM 34, shortwave 27 (1999)

Radios:

21 million (1997)

Television broadcast stations:

60 (1997)

Televisions:

4.59 million (1997)

Internet country code:

.co

Internet hosts:

1.554 million (2008)

Internet Service Providers (ISPs):

18 (2000)

Internet users:

12.1 million (2007)

Transportation

Colombia

Airports:

934 (2007)

Airports - with paved runways:

total: 103

over 3,047 m: 2

2,438 to 3,047 m: 8

1,524 to 2,437 m: 39

914 to 1,523 m: 42

under 914 m: 12 (2007)

Airports - with unpaved runways:

total: 831

over 3,047 m: 1

1,524 to 2,437 m: 34

914 to 1,523 m: 216

under 914 m: 580 (2007)

Heliports:

2 (2007)

Pipelines:

gas 4,329 km; oil 6,140 km; refined products 3,145 km (2007)

Railways:

total: 3,304 km

standard gauge: 150 km 1.435-m gauge

narrow gauge: 3,154 km 0.914-m gauge (2006)

Roadways:

total: 164,257 km (2005)

Waterways:

18,000 km (2006)

Merchant marine:

total: 17

by type: cargo 13, petroleum tanker 3, specialized tanker 1

registered in other countries: 6 (Antigua and Barbuda 2, Panama 4)

(2008)

Ports and terminals:

Barranquilla, Buenaventura, Cartagena, Santa Marta, Turbo

Military

Colombia

Military branches:

National Army (Ejercito Nacional), National Navy (Armada Nacional,

includes Naval Aviation, Naval Infantry (Infanteria de Marina,

Colmar), and Coast Guard), Colombian Air Force (Fuerza Aerea de

Colombia, FAC) (2008)

Military service age and obligation:

18-24 years of age for compulsory and voluntary military service;

service obligation - 18 months (2004)

Manpower available for military service:

males age 16-49: 11,478,109

females age 16-49: 11,809,279 (2008 est.)

Manpower fit for military service:

males age 16-49: 8,056,336

females age 16-49: 9,919,952 (2008 est.)

Manpower reaching militarily significant age annually:

male: 442,403

female: 433,192 (2008 est.)

Military expenditures:

3.4% of GDP (2005 est.)

Transnational Issues

Colombia

Disputes - international:

in December 2007, ICJ allocates San Andres, Providencia, and Santa

Catalina islands to Colombia under 1928 Treaty but does not rule on

82°W meridian as maritime boundary with Nicaragua; managed dispute

with Venezuela over maritime boundary and Venezuelan-administered

Los Monjes Islands near the Gulf of Venezuela; Colombian-organized

illegal narcotics, guerrilla, and paramilitary activities penetrate

all neighboring borders and have caused Colombian citizens to flee

mostly into neighboring countries; Colombia, Honduras, Nicaragua,

Jamaica, and the US assert various claims to Bajo Nuevo and

Serranilla Bank

Refugees and internally displaced persons:

IDPs: 1.8-3.5 million (conflict between government and illegal armed

groups and drug traffickers) (2007)

Illicit drugs:

illicit producer of coca, opium poppy, and cannabis; world's leading

coca cultivator with 167,000 hectares in coca cultivation in 2007, a

6% increase over 2006, producing a potential of 535 metric tons of

pure cocaine; the world's largest producer of coca derivatives;

supplies cocaine to most of the US market and the great majority of

other international drug markets; in 2007, aerial eradication

dispensed herbicide to treat over 153,000 hectares with another

67,000 hectares manually eradicated, but aggressive replanting on

the part of coca growers means Colombia remains a key producer; a

significant portion of non-US narcotics proceeds are either

laundered or invested in Colombia through the black market peso

exchange; important supplier of heroin to the US market; opium poppy

cultivation is estimated to have fallen 25% between 2006 and 2007

with a corresponding estimated 27% decline in the yield of pure

heroin to 1.9 metric tons; (2007)

This page was last updated on 18 December, 2008

======================================================================

@Comoros

Introduction

Comoros

Background:

Comoros has endured more than 20 coups or attempted coups since

gaining independence from France in 1975. In 1997, the islands of

Anjouan and Moheli declared independence from Comoros. In 1999,

military chief Col. AZALI seized power in a bloodless coup, and

helped negotiate the 2000 Fomboni Accords power-sharing agreement in

which the federal presidency rotates among the three islands, and

each island maintains its own local government. AZALI won the 2002

Presidential election, and each island in the archipelago elected

its own president. AZALI stepped down in 2006 and President SAMBI

took office. Since 2006, Anjouan's President Mohamed BACAR has

refused to work effectively with the Union presidency. In 2007,

BACAR effected Anjouan's de-facto secession from the Union, refusing

to step down in favor of fresh Anjouanais elections when Comoros'

other islands held legitimate elections in July. The African Union

(AU) initially attempted to resolve the political crisis by applying

sanctions and a naval blockade on Anjouan, but in March 2008, AU and

Comoran soldiers seized the island. The move was generally welcomed

by the island's inhabitants.

Geography

Comoros

Location:

Southern Africa, group of islands at the northern mouth of the

Mozambique Channel, about two-thirds of the way between northern

Madagascar and northern Mozambique

Geographic coordinates:

12 10 S, 44 15 E

Map references:

Africa

Area:

total: 2,170 sq km

land: 2,170 sq km

water: 0 sq km

Area - comparative:

slightly more than 12 times the size of Washington, DC

Land boundaries:

0 km

Coastline:

340 km

Maritime claims:

territorial sea: 12 nm

exclusive economic zone: 200 nm

Climate:

tropical marine; rainy season (November to May)

Terrain:

volcanic islands, interiors vary from steep mountains to low hills

Elevation extremes:

lowest point: Indian Ocean 0 m

highest point: Le Karthala 2,360 m

Natural resources:

NEGL

Land use:

arable land: 35.87%

permanent crops: 23.32%

other: 40.81% (2005)

Irrigated land:

NA

Total renewable water resources:

1.2 cu km (2003)

Freshwater withdrawal (domestic/industrial/agricultural):

total: 0.01 cu km/yr (48%/5%/47%)

per capita: 13 cu m/yr (1999)

Natural hazards:

cyclones possible during rainy season (December to April); Le

Kartala on Grand Comore is an active volcano

Environment - current issues:

soil degradation and erosion results from crop cultivation on slopes

without proper terracing; deforestation

Environment - international agreements:

party to: Biodiversity, Climate Change, Climate Change-Kyoto

Protocol, Desertification, Endangered Species, Hazardous Wastes, Law

of the Sea, Ozone Layer Protection, Ship Pollution, Wetlands

signed, but not ratified: none of the selected agreements

Geography - note:

important location at northern end of Mozambique Channel

People

Comoros

Population:

731,775 (July 2008 est.)

Age structure:

0-14 years: 42.4% (male 155,662/female 154,520)

15-64 years: 54.6% (male 197,178/female 202,231)

65 years and over: 3% (male 10,203/female 11,981) (2008 est.)

Median age:

total: 18.7 years

male: 18.5 years

female: 19 years (2008 est.)

Population growth rate:

2.803% (2008 est.)

Birth rate:

35.78 births/1,000 population (2008 est.)

Death rate:

7.76 deaths/1,000 population (2008 est.)

Net migration rate:

NA (2008 est.)

Sex ratio:

at birth: 1.03 male(s)/female

under 15 years: 1.01 male(s)/female

15-64 years: 0.98 male(s)/female

65 years and over: 0.85 male(s)/female

total population: 0.98 male(s)/female (2008 est.)

Infant mortality rate:

total: 68.58 deaths/1,000 live births

male: 76.65 deaths/1,000 live births

female: 60.28 deaths/1,000 live births (2008 est.)

Life expectancy at birth:

total population: 63.1 years

male: 60.72 years

female: 65.55 years (2008 est.)

Total fertility rate:

4.9 children born/woman (2008 est.)

HIV/AIDS - adult prevalence rate:

0.12% (2001 est.)

HIV/AIDS - people living with HIV/AIDS:

NA

HIV/AIDS - deaths:

NA

Nationality:

noun: Comoran(s)

adjective: Comoran

Ethnic groups:

Antalote, Cafre, Makoa, Oimatsaha, Sakalava

Religions:

Sunni Muslim 98%, Roman Catholic 2%

Languages:

Arabic (official), French (official), Shikomoro (a blend of Swahili

and Arabic)

Literacy:

definition: age 15 and over can read and write

total population: 56.5%

male: 63.6%

female: 49.3% (2003 est.)

School life expectancy (primary to tertiary education):

total: 8 years

male: 9 years

female: 7 years (2004)

Education expenditures:

3.8% of GDP (2002)

Government

Comoros

Country name:

conventional long form: Union of the Comoros

conventional short form: Comoros

local long form: Union des Comores

local short form: Comores

Government type:

republic

Capital:

name: Moroni

geographic coordinates: 11 42 S, 43 14 E

time difference: UTC+3 (8 hours ahead of Washington, DC during

Standard Time)

Administrative divisions:

3 islands and 4 municipalities*; Grande Comore, Anjouan, Domoni*,

Fomboni*, Moheli, Moroni*, Mutsamudu*

Independence:

6 July 1975 (from France)

National holiday:

Independence Day, 6 July (1975)

Constitution:

23 December 2001

Legal system:

French and Islamic law in a new consolidated code; has not accepted

compulsory ICJ jurisdiction

Suffrage:

18 years of age; universal

Executive branch:

chief of state: President Ahmed Abdallah SAMBI (since 26 May 2006)

head of government: President Ahmed Abdallah SAMBI (since 26 May

2006)

cabinet: Council of Ministers appointed by the president

elections: as defined by the 2001 constitution, the presidency

rotates every four years among the elected presidents from the three

main islands in the Union; election last held 14 May 2006 (next to

be held by May 2010); prime minister appointed by the president;

note - the post of prime minister has been vacant since May 2002

election results: Ahmed Abdallah SAMBI elected president; percent of

vote - Ahmed Abdallah SAMBI 58.0%, Ibrahim HALIDI 28.3%, Mohamed

DJAANFAMI 13.7%

Legislative branch:

unicameral Assembly of the Union (33 seats; 15 deputies are selected

by the individual islands' local assemblies and 18 by universal

suffrage; to serve for five years);

elections: last held 18 and 25 April 2004 (next to be held in 2009)

election results: percent of vote by party - NA; seats by party -

CdIA 12, CRC 6; note - 15 additional seats are filled by deputies

from local island assemblies

Judicial branch:

Supreme Court or Cour Supremes (two members appointed by the

president, two members elected by the Federal Assembly, one elected

by the Council of each island, and others are former presidents of

the republic)

Political parties and leaders:

Convention for the Renewal of the Comoros or CRC [AZALI Assowmani];

Camp of the Autonomous Islands or CdIA (a coalition of parties

organized by the islands' presidents in opposition to the Union

President); Front National pour la Justice or FNJ [Ahmed RACHID]

(Islamic party in opposition); Mouvement pour la Democratie et le

Progress or MDP-NGDC [Abbas DJOUSSOUF]; Parti Comorien pour la

Democratie et le Progress or PCDP [Ali MROUDJAE]; Rassemblement

National pour le Development or RND [Omar TAMOU, Abdoulhamid

AFFRAITANE]

Political pressure groups and leaders:

other: environmentalists

International organization participation:

ACCT, ACP, AfDB, AMF, AU, COMESA, FAO, FZ, G-77, IBRD, ICAO, ICCt,

ICRM, IDA, IDB, IFAD, IFC, IFRCS, ILO, IMF, IMO, IMSO, InOC,

Interpol, IOC, IPU, ITSO, ITU, ITUC, LAS, NAM, OIC, OIF, OPCW, UN,

UNCTAD, UNESCO, UNIDO, UPU, WCO, WFTU, WHO, WIPO, WMO, WTO (observer)

Diplomatic representation in the US:

chief of mission: Representative to the US and Ambassador to the UN

Mohamed TOIHIRI

chancery: Mission to the US, 866 United Nations Plaza, Suite 418,

New York, NY 10017

telephone: [1] (212) 750-1637

Diplomatic representation from the US:

the US does not have an embassy in Comoros; the ambassador to

Madagascar is accredited to Comoros

Flag description:

four equal horizontal bands of yellow (top), white, red, and blue

with a green isosceles triangle based on the hoist; centered within

the triangle is a white crescent with the convex side facing the

hoist and four white, five-pointed stars placed vertically in a line

between the points of the crescent; the horizontal bands and the

four stars represent the four main islands of the archipelago -

Mwali, Njazidja, Nzwani, and Mahore (Mayotte - territorial

collectivity of France, but claimed by Comoros)

note: the crescent, stars, and color green are traditional symbols

of Islam

Economy

Comoros

Economy - overview:

One of the world's poorest countries, Comoros is made up of three

islands that have inadequate transportation links, a young and

rapidly increasing population, and few natural resources. The low

educational level of the labor force contributes to a subsistence

level of economic activity, high unemployment, and a heavy

dependence on foreign grants and technical assistance. Agriculture,

including fishing, hunting, and forestry, contributes 40% to GDP,

employs 80% of the labor force, and provides most of the exports.

The country is not self-sufficient in food production; rice, the

main staple, accounts for the bulk of imports. The government -

which is hampered by internal political disputes - is struggling to

upgrade education and technical training, privatize commercial and

industrial enterprises, improve health services, diversify exports,

promote tourism, and reduce the high population growth rate. The

political problems caused the economy to contract in 2007.

Remittances from 150,000 Comorans abroad help supplement GDP.

GDP (purchasing power parity):

$1.262 billion (2007 est.)

GDP (official exchange rate):

$442 million (2007 est.)

GDP - real growth rate:

-1% (2007 est.)

GDP - per capita (PPP):

$1,100 (2007 est.)

GDP - composition by sector:

agriculture: 40%

industry: 4%

services: 56% (2001 est.)

Labor force:

144,500 (1996 est.)

Labor force - by occupation:

agriculture: 80%

industry and services: 20% (1996 est.)

Unemployment rate:

20% (1996 est.)

Population below poverty line:

60% (2002 est.)

Household income or consumption by percentage share:

lowest 10%: NA%

highest 10%: NA%

Budget:

revenues: $27.6 million

expenditures: $NA (2001 est.)

Fiscal year:

calendar year

Inflation rate (consumer prices):

3% (2007 est.)

Central bank discount rate:

5.36% (31 December 2007)

Commercial bank prime lending rate:

10.5% (31 December 2007)

Stock of money:

$76.68 million (31 December 2007)

Stock of quasi money:

$23.39 million (31 December 2007)

Stock of domestic credit:

$45.09 million (31 December 2007)

Agriculture - products:

vanilla, cloves, ylang-ylang, perfume essences, copra, coconuts,

bananas, cassava (tapioca)

Industries:

fishing, tourism, perfume distillation

Industrial production growth rate:

-2% (1999 est.)

Electricity - production:

20 million kWh (2006 est.)

Electricity - consumption:

18.6 million kWh (2006 est.)

Electricity - exports:

0 kWh (2007 est.)

Electricity - imports:

0 kWh (2007 est.)

Electricity - production by source:

fossil fuel: 90.6%

hydro: 9.4%

nuclear: 0%

other: 0% (2001)

Oil - production:

0 bbl/day (2007 est.)

Oil - consumption:

712.3 bbl/day (2006 est.)

Oil - exports:

0 bbl/day (2005)

Oil - imports:

755.4 bbl/day (2005)

Oil - proved reserves:

0 bbl (1 January 2006 est.)

Natural gas - production:

0 cu m (2007 est.)

Natural gas - consumption:

0 cu m (2007 est.)

Natural gas - exports:

0 cu m (2007 est.)

Natural gas - imports:

0 cu m (2007 est.)

The 2008 CIA World Factbook · 第 43 / 374 段