tropical along coast, becoming cooler inland at higher elevations;

tropical in Amazonian jungle lowlands

Terrain:

coastal plain (costa), inter-Andean central highlands (sierra), and

flat to rolling eastern jungle (oriente)

Elevation extremes:

lowest point: Pacific Ocean 0 m

highest point: Chimborazo 6,267 m

Natural resources:

petroleum, fish, timber, hydropower

Land use:

arable land: 5.71%

permanent crops: 4.81%

other: 89.48% (2005)

Irrigated land:

8,650 sq km (2003)

Total renewable water resources:

432 cu km (2000)

Freshwater withdrawal (domestic/industrial/agricultural):

total: 16.98 cu km/yr (12%/5%/82%)

per capita: 1,283 cu m/yr (2000)

Natural hazards:

frequent earthquakes, landslides, volcanic activity; floods;

periodic droughts

Environment - current issues:

deforestation; soil erosion; desertification; water pollution;

pollution from oil production wastes in ecologically sensitive areas

of the Amazon Basin and Galapagos Islands

Environment - international agreements:

party to: Antarctic-Environmental Protocol, Antarctic Treaty,

Biodiversity, Climate Change, Climate Change-Kyoto Protocol,

Desertification, Endangered Species, Hazardous Wastes, Ozone Layer

Protection, Ship Pollution, Tropical Timber 83, Tropical Timber 94,

Wetlands

signed, but not ratified: none of the selected agreements

Geography - note:

Cotopaxi in Andes is highest active volcano in world

People

Ecuador

Population:

13,927,650 (July 2008 est.)

Age structure:

0-14 years: 32.1% (male 2,274,986/female 2,189,437)

15-64 years: 62.7% (male 4,355,909/female 4,381,141)

65 years and over: 5.2% (male 340,861/female 385,316) (2008 est.)

Median age:

total: 24.2 years

male: 23.7 years

female: 24.7 years (2008 est.)

Population growth rate:

0.935% (2008 est.)

Birth rate:

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

Death rate:

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

Net migration rate:

-7.98 migrant(s)/1,000 population (2008 est.)

Sex ratio:

at birth: 1.05 male(s)/female

under 15 years: 1.04 male(s)/female

15-64 years: 0.99 male(s)/female

65 years and over: 0.88 male(s)/female

total population: 1 male(s)/female (2008 est.)

Infant mortality rate:

total: 21.35 deaths/1,000 live births

male: 25.61 deaths/1,000 live births

female: 16.88 deaths/1,000 live births (2008 est.)

Life expectancy at birth:

total population: 76.81 years

male: 73.94 years

female: 79.84 years (2008 est.)

Total fertility rate:

2.59 children born/woman (2008 est.)

HIV/AIDS - adult prevalence rate:

0.3% (2003 est.)

HIV/AIDS - people living with HIV/AIDS:

21,000 (2003 est.)

HIV/AIDS - deaths:

1,700 (2003 est.)

Major infectious diseases:

degree of risk: high

food or waterborne diseases: bacterial diarrhea, hepatitis A, and

typhoid fever

vectorborne diseases: dengue fever, malaria, and yellow fever

water contact disease: leptospirosis (2008)

Nationality:

noun: Ecuadorian(s)

adjective: Ecuadorian

Ethnic groups:

mestizo (mixed Amerindian and white) 65%, Amerindian 25%, Spanish

and others 7%, black 3%

Religions:

Roman Catholic 95%, other 5%

Languages:

Spanish (official), Amerindian languages (especially Quechua)

Literacy:

definition: age 15 and over can read and write

total population: 91%

male: 92.3%

female: 89.7% (2001 census)

Education expenditures:

1% of GDP (2001)

Government

Ecuador

Country name:

conventional long form: Republic of Ecuador

conventional short form: Ecuador

local long form: Republica del Ecuador

local short form: Ecuador

Government type:

republic

Capital:

name: Quito

geographic coordinates: 0 13 S, 78 30 W

time difference: UTC-5 (same time as Washington, DC during Standard

Time)

Administrative divisions:

24 provinces (provincias, singular - provincia); Azuay, Bolivar,

Canar, Carchi, Chimborazo, Cotopaxi, El Oro, Esmeraldas, Galapagos,

Guayas, Imbabura, Loja, Los Rios, Manabi, Morona-Santiago, Napo,

Orellana, Pastaza, Pichincha, Santa Elena, Santo Domingo de los

Tsachilas, Sucumbios, Tungurahua, Zamora-Chinchipe

Independence:

24 May 1822 (from Spain)

National holiday:

Independence Day (independence of Quito), 10 August (1809)

Constitution:

10 August 1998

Legal system:

based on civil law system; has not accepted compulsory ICJ

jurisdiction

Suffrage:

18 years of age; universal, compulsory for literate persons ages

18-65, optional for other eligible voters

Executive branch:

chief of state: President Rafael CORREA Delgado (since 15 January

2007); Vice President Lenin MORENO Garces (since 15 January 2007);

note - the president is both the chief of state and head of

government

head of government: President Rafael CORREA Delgado (since 15

January 2007); Vice President Lenin MORENO Garces (since 15 January

2007)

cabinet: Cabinet appointed by the president

elections: the president and vice president are elected on the same

ticket by popular vote for a four-year term (may not serve

consecutive terms); election last held 15 October 2006 with a runoff

election on 26 November 2006 (next to be held in October 2010)

election results: Rafael CORREA Delgado elected president; percent

of vote - Rafael CORREA Delgado 56.7%; Alvaro NOBOA 43.3%

Legislative branch:

unicameral National Congress or Congreso Nacional (100 seats;

members are elected through a party-list proportional representation

system to serve four-year terms)

elections: last held 15 October 2006 (next to be held in October

2010)

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

PRIAN 28; PSP 24; PSC 13; ID 7; PRE 6; MUPP-NP 6; RED 5; UDC 5;

other 6; note - defections by members of National Congress are

commonplace, resulting in frequent changes in the numbers of seats

held by the various parties; as of 29 November 2007, Congress is on

indefinite recess while a Constituent Assembly is convened

Judicial branch:

Supreme Court or Corte Suprema (according to the Constitution, new

justices are elected by the full Supreme Court; in December 2004,

however, Congress successfully replaced the entire court via a

simple-majority resolution)

Political parties and leaders:

Alianza PAIS Movement [Rafael Vicente CORREA Delgado]; Christian

Democratic Union or UDC [Diego ORDONEZ Guerrero]; Democratic Left or

ID [Andres PAEZ Benalcazar]; Ethical and Democratic Network or RED

[Leon ROLDOS]; Institutional Renewal and National Action Party or

PRIAN [Alvaro NOBOA]; Pachakutik Plurinational Unity Movement - New

Country or MUPP-NP [Jorge GUAMAN]; Patriotic Society Party or PSP

[Lucio GUTIERREZ Borbua]; Popular Democratic Movement or MPD [Ciro

GUZMAN Aldaz]; Roldosist Party or PRE [Abdala BUCARAM Ortiz,

director]; Social Christian Party or PSC [Pascual DEL CIOPPO];

Socialist Party - Broad Front or PS-FA [Gustavo AYALA Cruz]

Political pressure groups and leaders:

Confederation of Indigenous Nationalities of Ecuador or CONAIE

[Marlon SANTI, president]; Coordinator of Social Movements or CMS

[F. Napoleon SANTOS]; Federation of Indigenous Evangelists of

Ecuador or FEINE [Marco MURILLO, president]; National Federation of

Indigenous Afro-Ecuatorianos and Peasants or FENOCIN [Pedro DE LA

CRUZ, president]

International organization participation:

CAN, FAO, G-77, IADB, IAEA, IBRD, ICAO, ICC, ICCt, ICRM, IDA, IFAD,

IFC, IFRCS, IHO, ILO, IMF, IMO, Interpol, IOC, IOM, IPU, ISO, ITSO,

ITU, ITUC, LAES, LAIA, Mercosur (associate), MIGA, MINURCAT,

MINUSTAH, NAM, OAS, OPANAL, OPCW, OPEC, PCA, RG, UN, UNASUR, UNCTAD,

UNESCO, UNHCR, UNIDO, Union Latina, UNMIL, UNMIS, UNOCI, UNWTO, UPU,

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

Diplomatic representation in the US:

chief of mission: Ambassador Luis Benigno GALLEGOS Chiriboga

chancery: 2535 15th Street NW, Washington, DC 20009

telephone: [1] (202) 234-7200

FAX: [1] (202) 667-3482

consulate(s) general: Atlanta, Boston, Chicago, Dallas, Denver,

Houston, Jersey City (New Jersey), Los Angeles, Miami, New Orleans,

New York, San Francisco, San Juan (Puerto Rico), Washington, DC

Diplomatic representation from the US:

chief of mission: Ambassador Heather HODGES

embassy: Avenida Avigiras E12-170 y Avenida Eloy Alfaro, Quito

mailing address: Avenida Guayacanes N52-205 y Avenida Avigiras

telephone: [593] (2) 398-5000

FAX: [593] (2) 398-5100

consulate(s) general: Guayaquil

Flag description:

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

with the coat of arms superimposed at the center of the flag;

similar to the flag of Colombia, which is shorter and does not bear

a coat of arms

Economy

Ecuador

Economy - overview:

Ecuador is substantially dependent on its petroleum resources, which

have accounted for more than half of the country's export earnings

and one-fourth of public sector revenues in recent years. In

1999/2000, Ecuador suffered a severe economic crisis, with GDP

contracted by more than 6%, with a significant increase in poverty.

The banking system also collapsed, and Ecuador defaulted on its

external debt later that year. In March 2000, Congress approved a

series of structural reforms that also provided for the adoption of

the US dollar as legal tender. Dollarization stabilized the economy,

and positive growth returned in the years that followed, helped by

high oil prices, remittances, and increased non-traditional exports.

From 2002-06 the economy grew 5.5%, the highest five-year average in

25 years. The poverty rate declined but remained high at 38% in

2006. In 2006 the government of Alfredo PALACIO (2005-07) seized the

assets of Occidental Petroleum for alleged contract violations and

imposed a windfall revenue tax on foreign oil companies, leading to

the suspension of free trade negotiations with the US. These

measures, combined with chronic underinvestment in the state oil

company, Petroecuador, led to a drop in petroleum production in

2007. PALACIO's successor, Rafael CORREA, raised the specter of debt

default - but Ecuador has paid its debt on time. He also decreed a

higher windfall revenue tax on private oil companies, then sought to

renegotiate their contracts to overcome the debilitating effect of

the tax. This generated economic uncertainty; private investment has

dropped and economic growth has slowed significantly.

GDP (purchasing power parity):

$98.71 billion (2007 est.)

GDP (official exchange rate):

$44.18 billion (2007 est.)

GDP - real growth rate:

2% (2007 est.)

GDP - per capita (PPP):

$7,200 (2007 est.)

GDP - composition by sector:

agriculture: 6.7%

industry: 35.1%

services: 58.2% (2007 est.)

Labor force:

4.51 million (urban) (2007 est.)

Labor force - by occupation:

agriculture: 8%

industry: 24%

services: 68% (2001)

Unemployment rate:

8.8% (2007 est.)

Population below poverty line:

38.3% (2006)

Household income or consumption by percentage share:

lowest 10%: 2%

highest 10%: 35%

note: data for urban households only (October 2006)

Distribution of family income - Gini index:

46

note: data are for urban households (2006)

Investment (gross fixed):

21.9% of GDP (2007 est.)

Budget:

revenues: $13.46 billion

expenditures: planned $11.96 billion (2007 est.)

Fiscal year:

calendar year

Public debt:

33.1% of GDP (2007 est.)

Inflation rate (consumer prices):

2.3% (2007 est.)

Central bank discount rate:

10.72% (31 December 2007)

Commercial bank prime lending rate:

12.08% (31 December 2007)

Stock of money:

$4.395 billion (31 December 2007)

Stock of quasi money:

$7.974 billion (31 December 2007)

Stock of domestic credit:

$8.926 billion (31 December 2007)

Agriculture - products:

bananas, coffee, cocoa, rice, potatoes, manioc (tapioca), plantains,

sugarcane; cattle, sheep, pigs, beef, pork, dairy products; balsa

wood; fish, shrimp

Industries:

petroleum, food processing, textiles, wood products, chemicals

Industrial production growth rate:

1.4% (2007 est.)

Electricity - production:

14.84 billion kWh (2006 est.)

Electricity - consumption:

12.9 billion kWh (2006 est.)

Electricity - exports:

38.53 million kWh (2006 est.)

Electricity - imports:

861 million kWh (2006 est.)

Electricity - production by source:

fossil fuel: 81%

hydro: 19%

nuclear: 0%

other: 0% (2001)

Oil - production:

511,600 bbl/day (2007 est.)

Oil - consumption:

160,500 bbl/day (2006 est.)

Oil - exports:

421,700 bbl/day (2005 est.)

Oil - imports:

47,060 bbl/day (2005)

Oil - proved reserves:

4.517 billion bbl (1 January 2008 est.)

Natural gas - production:

280 million cu m (2006 est.)

Natural gas - consumption:

280 million cu m (2006 est.)

Natural gas - exports:

0 cu m (2007 est.)

Natural gas - imports:

0 cu m (2007 est.)

Natural gas - proved reserves:

9.369 billion cu m (1 January 2006 est.)

Current account balance:

$1.064 billion (2007 est.)

Exports:

$14.37 billion (2007 est.)

Exports - commodities:

petroleum, bananas, cut flowers, shrimp, cacao, coffee, hemp, wood,

fish

Exports - partners:

US 41.9%, Peru 8.5%, Chile 4.9%, Russia 4.8%, Colombia 4.7% (2007)

Imports:

$12.76 billion (2007 est.)

Imports - commodities:

industrial materials, fuels and lubricants, nondurable consumer goods

Imports - partners:

US 23.7%, Colombia 10.3%, China 7.6%, Brazil 5.3%, Japan 4.3% (2007)

Economic aid - recipient:

$209.5 million (2005)

Reserves of foreign exchange and gold:

$3.521 billion (30 November 2007 est.)

Debt - external:

$17.12 billion (31 December 2007)

Stock of direct foreign investment - at home:

$16.31 billion (2007 est.)

Stock of direct foreign investment - abroad:

$1.456 billion (2007 est.)

Market value of publicly traded shares:

$4.04 billion (2006)

Currency (code):

US dollar (USD)

Currency code:

USD

Exchange rates:

the US dollar is used; the sucre was eliminated in 2000

Communications

Ecuador

Telephones - main lines in use:

1.805 million (2007)

Telephones - mobile cellular:

10.086 million (2007)

Telephone system:

general assessment: generally elementary but being expanded

domestic: fixed-line services provided by three state-owned

enterprises; plans to transfer the state-owned operators to private

ownership have repeatedly failed; fixed-line density stands at about

13 per 100 persons; mobile cellular use has surged and has a

subscribership of nearly 75 per 100 persons

international: country code - 593; landing point for the PAN-AM

submarine telecommunications cable that provides links to the west

coast of South America, Panama, Colombia, Venezuela, and extending

onward to Aruba and the US Virgin Islands in the Caribbean;

satellite earth station - 1 Intelsat (Atlantic Ocean) (2007)

Radio broadcast stations:

AM 392, FM 35, shortwave 29 (2001)

Radios:

5 million (2001)

Television broadcast stations:

7 (plus 14 repeaters) (2000)

Televisions:

2.5 million (2001)

Internet country code:

.ec

Internet hosts:

45,404 (2008)

Internet Service Providers (ISPs):

31 (2001)

Internet users:

1.549 million (2006)

Transportation

Ecuador

Airports:

406 (2007)

Airports - with paved runways:

total: 104

over 3,047 m: 4

2,438 to 3,047 m: 3

1,524 to 2,437 m: 17

914 to 1,523 m: 26

under 914 m: 54 (2007)

Airports - with unpaved runways:

total: 302

914 to 1,523 m: 34

under 914 m: 268 (2007)

Heliports:

1 (2007)

Pipelines:

extra heavy crude oil 578 km; gas 71 km; oil 1,389 km; refined

products 1,185 km (2007)

Railways:

total: 966 km

narrow gauge: 966 km 1.067-m gauge (2006)

Roadways:

total: 43,670 km

paved: 6,472 km

unpaved: 37,198 km (2006)

Waterways:

1,500 km (most inaccessible) (2006)

Merchant marine:

total: 37

by type: cargo 1, chemical tanker 1, liquefied gas 1, passenger 8,

petroleum tanker 24, refrigerated cargo 1, specialized tanker 1

foreign-owned: 1 (US 1)

registered in other countries: 5 (China 1, Panama 4) (2008)

Ports and terminals:

Esmeraldas, Guayaquil, Manta, Puerto Bolivar

Military

Ecuador

Military branches:

Army, Navy (includes Naval Infantry, Naval Aviation, Coast Guard),

Air Force (Fuerza Aerea Ecuatoriana, FAE) (2007)

Military service age and obligation:

20 years of age for selective conscript military service; 12-month

service obligation (2008)

Manpower available for military service:

males age 16-49: 3,536,602

females age 16-49: 3,559,188 (2008 est.)

Manpower fit for military service:

males age 16-49: 3,030,664

females age 16-49: 3,037,892 (2008 est.)

Manpower reaching militarily significant age annually:

male: 144,821

female: 139,091 (2008 est.)

Military expenditures:

2.8% of GDP (2006)

Transnational Issues

Ecuador

Disputes - international:

organized illegal narcotics operations in Colombia penetrate across

Ecuador's shared border, which thousands of Colombians also cross to

escape the violence in their home country

Refugees and internally displaced persons:

refugees (country of origin): 11,526 (Colombia); note - UNHCR

estimates as many as 250,000 Columbians are seeking asylum in

Ecuador, many of whom do not register as refugees for fear of

deportation (2007)

Illicit drugs:

significant transit country for cocaine originating in Colombia and

Peru, with over half of the US-bound cocaine passing through

Ecuadorian Pacific waters; importer of precursor chemicals used in

production of illicit narcotics; attractive location for

cash-placement by drug traffickers laundering money because of

dollarization and weak anti-money-laundering regime; increased

activity on the northern frontier by trafficking groups and

Colombian insurgents

This page was last updated on 18 December, 2008

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

@Egypt

Introduction

Egypt

Background:

The regularity and richness of the annual Nile River flood, coupled

with semi-isolation provided by deserts to the east and west,

allowed for the development of one of the world's great

civilizations. A unified kingdom arose circa 3200 B.C., and a series

of dynasties ruled in Egypt for the next three millennia. The last

native dynasty fell to the Persians in 341 B.C., who in turn were

replaced by the Greeks, Romans, and Byzantines. It was the Arabs who

introduced Islam and the Arabic language in the 7th century and who

ruled for the next six centuries. A local military caste, the

Mamluks took control about 1250 and continued to govern after the

conquest of Egypt by the Ottoman Turks in 1517. Following the

completion of the Suez Canal in 1869, Egypt became an important

world transportation hub, but also fell heavily into debt.

Ostensibly to protect its investments, Britain seized control of

Egypt's government in 1882, but nominal allegiance to the Ottoman

Empire continued until 1914. Partially independent from the UK in

1922, Egypt acquired full sovereignty with the overthrow of the

British-backed monarchy in 1952. The completion of the Aswan High

Dam in 1971 and the resultant Lake Nasser have altered the

time-honored place of the Nile River in the agriculture and ecology

of Egypt. A rapidly growing population (the largest in the Arab

world), limited arable land, and dependence on the Nile all continue

to overtax resources and stress society. The government has

struggled to meet the demands of Egypt's growing population through

economic reform and massive investment in communications and

physical infrastructure.

Geography

Egypt

Location:

Northern Africa, bordering the Mediterranean Sea, between Libya and

the Gaza Strip, and the Red Sea north of Sudan, and includes the

Asian Sinai Peninsula

Geographic coordinates:

27 00 N, 30 00 E

Map references:

Africa

Area:

total: 1,001,450 sq km

land: 995,450 sq km

water: 6,000 sq km

Area - comparative:

slightly more than three times the size of New Mexico

Land boundaries:

total: 2,665 km

border countries: Gaza Strip 11 km, Israel 266 km, Libya 1,115 km,

Sudan 1,273 km

Coastline:

2,450 km

Maritime claims:

territorial sea: 12 nm

contiguous zone: 24 nm

exclusive economic zone: 200 nm

continental shelf: 200 m depth or to the depth of exploitation

Climate:

desert; hot, dry summers with moderate winters

Terrain:

vast desert plateau interrupted by Nile valley and delta

Elevation extremes:

lowest point: Qattara Depression -133 m

highest point: Mount Catherine 2,629 m

Natural resources:

petroleum, natural gas, iron ore, phosphates, manganese, limestone,

gypsum, talc, asbestos, lead, zinc

Land use:

arable land: 2.92%

permanent crops: 0.5%

other: 96.58% (2005)

Irrigated land:

34,220 sq km (2003)

Total renewable water resources:

86.8 cu km (1997)

Freshwater withdrawal (domestic/industrial/agricultural):

total: 68.3 cu km/yr (8%/6%/86%)

per capita: 923 cu m/yr (2000)

Natural hazards:

periodic droughts; frequent earthquakes, flash floods, landslides;

hot, driving windstorm called khamsin occurs in spring; dust storms,

sandstorms

Environment - current issues:

agricultural land being lost to urbanization and windblown sands;

increasing soil salination below Aswan High Dam; desertification;

oil pollution threatening coral reefs, beaches, and marine habitats;

other water pollution from agricultural pesticides, raw sewage, and

industrial effluents; limited natural fresh water resources away

from the Nile, which is the only perennial water source; rapid

growth in population overstraining the Nile and natural resources

Environment - international agreements:

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

Protocol, Desertification, Endangered Species, Environmental

Modification, Hazardous Wastes, Law of the Sea, Marine Dumping,

Ozone Layer Protection, Ship Pollution, Tropical Timber 83, Tropical

Timber 94, Wetlands

signed, but not ratified: none of the selected agreements

Geography - note:

controls Sinai Peninsula, only land bridge between Africa and

remainder of Eastern Hemisphere; controls Suez Canal, a sea link

between Indian Ocean and Mediterranean Sea; size, and juxtaposition

to Israel, establish its major role in Middle Eastern geopolitics;

dependence on upstream neighbors; dominance of Nile basin issues;

prone to influxes of refugees

People

Egypt

Population:

81,713,520 (July 2008 est.)

Age structure:

0-14 years: 31.8% (male 13,292,961/female 12,690,711)

15-64 years: 63.5% (male 26,257,440/female 25,627,390)

65 years and over: 4.7% (male 1,636,560/female 2,208,455) (2008 est.)

Median age:

total: 24.5 years

male: 24.1 years

female: 24.9 years (2008 est.)

Population growth rate:

1.682% (2008 est.)

Birth rate:

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

Death rate:

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

Net migration rate:

-0.21 migrant(s)/1,000 population (2008 est.)

Sex ratio:

at birth: 1.05 male(s)/female

under 15 years: 1.05 male(s)/female

15-64 years: 1.02 male(s)/female

65 years and over: 0.74 male(s)/female

total population: 1.02 male(s)/female (2008 est.)

Infant mortality rate:

total: 28.36 deaths/1,000 live births

male: 30.06 deaths/1,000 live births

female: 26.57 deaths/1,000 live births (2008 est.)

Life expectancy at birth:

total population: 71.85 years

male: 69.3 years

female: 74.52 years (2008 est.)

Total fertility rate:

2.72 children born/woman (2008 est.)

HIV/AIDS - adult prevalence rate:

less than 0.1% (2001 est.)

HIV/AIDS - people living with HIV/AIDS:

12,000 (2001 est.)

HIV/AIDS - deaths:

700 (2003 est.)

Major infectious diseases:

degree of risk: intermediate

food or waterborne diseases: bacterial diarrhea, hepatitis A, and

typhoid fever

water contact disease: schistosomiasis

note: highly pathogenic H5N1 avian influenza has been identified in

this country; it poses a negligible risk with extremely rare cases

possible among US citizens who have close contact with birds (2008)

Nationality:

noun: Egyptian(s)

adjective: Egyptian

Ethnic groups:

Egyptian 99.6%, other 0.4% (2006 census)

Religions:

Muslim (mostly Sunni) 90%, Coptic 9%, other Christian 1%

Languages:

Arabic (official), English and French widely understood by educated

classes

Literacy:

definition: age 15 and over can read and write

total population: 71.4%

male: 83%

female: 59.4% (2005 est.)

The 2008 CIA World Factbook · 第 55 / 374 段