Total area:

73,600,000 km2

Land area:

73,600,000 km2; Arabian Sea, Bass Strait, Bay of Bengal, Java Sea, Persian

Gulf, Red Sea, Strait of Malacca, Timor Sea, and other tributary water

bodies

Comparative area:

slightly less than eight times the size of the US; third-largest ocean

(after the Pacific Ocean and Atlantic Ocean, but larger than the Arctic

Ocean)

Coastline:

66,526 km

Disputes:

some maritime disputes (see littoral states)

Climate:

northeast monsoon (December to April), southwest monsoon (June to October);

tropical cyclones occur during May/June and October/November in the north

Indian Ocean and January/February in the south Indian Ocean

Terrain:

surface dominated by counterclockwise gyre (broad, circular system of

currents) in the south Indian Ocean; unique reversal of surface currents in

the north Indian Ocean - low pressure over southwest Asia from hot, rising,

summer air results in the southwest monsoon and southwest-to-northeast winds

and currents, while high pressure over northern Asia from cold, falling,

winter air results in the northeast monsoon and northeast-to-southwest winds

and currents; ocean floor is dominated by the Mid-Indian Ocean Ridge and

subdivided by the Southeast Indian Ocean Ridge, Southwest Indian Ocean

Ridge, and Ninety East Ridge; maximum depth is 7,258 meters in the Java

Trench

Natural resources:

oil and gas fields, fish, shrimp, sand and gravel aggregates, placer

deposits, polymetallic nodules

Environment:

endangered marine species include the dugong, seals, turtles, and whales;

oil pollution in the Arabian Sea, Persian Gulf, and Red Sea

Note:

major chokepoints include Bab el Mandeb, Strait of Hormuz, Strait of

Malacca, southern access to the Suez Canal, and the Lombok Strait; ships

subject to superstructure icing in extreme south near Antarctica from May to

October

:Indian Ocean Economy

Overview:

The Indian Ocean provides a major highway for the movement of petroleum

products from the Middle East to Europe and North and South American

countries. Fish from the ocean are of growing economic importance to many of

the bordering countries as a source of both food and exports. Fishing fleets

from Russia, Japan, Korea, and Taiwan also exploit the Indian Ocean, mainly

for shrimp and tuna. Large reserves of hydrocarbons are being tapped in the

offshore areas of Saudi Arabia, Iran, India, and Western Australia. An

estimated 40% of the world's offshore oil production comes from the Indian

Ocean. Beach sands rich in heavy minerals and offshore placer deposits are

actively exploited by bordering countries, particularly India, South Africa,

Indonesia, Sri Lanka, and Thailand.

Industries:

based on exploitation of natural resources, particularly marine life,

minerals, oil and gas production, fishing, sand and gravel aggregates,

placer deposits

:Indian Ocean Communications

Ports:

Bombay (India), Calcutta (India), Madras (India), Colombo (Sri Lanka),

Durban (South Africa), Fremantle (Australia), Jakarta (Indonesia), Melbourne

(Australia), Richard's Bay (South Africa)

Telecommunications:

submarine cables from India to United Arab Emirates and Malaysia

:Indonesia Geography

Total area:

1,919,440 km2

Land area:

1,826,440 km2

Comparative area:

slightly less than three times the size of Texas

Land boundaries:

2,602 km; Malaysia 1,782 km, Papua New Guinea 820 km

Coastline:

54,716 km

Maritime claims:

(measured from claimed archipelagic baselines)

Exclusive economic zone:

200 nm

Territorial sea:

12 nm

Disputes:

sovereignty over Timor Timur (East Timor Province) disputed with Portugal

Climate:

tropical; hot, humid; more moderate in highlands

Terrain:

mostly coastal lowlands; larger islands have interior mountains

Natural resources:

crude oil, tin, natural gas liquids, nickel, timber, bauxite, copper,

fertile soils, coal, gold, silver

Land use:

arable land 8%; permanent crops 3%; meadows and pastures 7%; forest and

woodland 67%; other 15%; includes irrigated 3%

Environment:

archipelago of 13,500 islands (6,000 inhabited); occasional floods, severe

droughts, and tsunamis; deforestation

Note:

straddles Equator; strategic location astride or along major sea lanes from

Indian Ocean to Pacific Ocean

:Indonesia People

Population:

195,683,531 (July 1992), growth rate 1.7% (1992)

Birth rate:

25 births/1,000 population (1992)

Death rate:

8 deaths/1,000 population (1992)

Net migration rate:

0 migrants/1,000 population (1992)

Infant mortality rate:

70 deaths/1,000 live births (1992)

Life expectancy at birth:

59 years male, 64 years female (1992)

Total fertility rate:

2.8 children born/woman (1992)

Nationality:

noun - Indonesian(s); adjective - Indonesian

Ethnic divisions:

majority of Malay stock comprising Javanese 45.0%, Sundanese 14.0%, Madurese

7.5%, coastal Malays 7.5%, other 26.0%

Religions:

Muslim 87%, Protestant 6%, Roman Catholic 3%, Hindu 2%, Buddhist 1%, other

1% (1985)

Languages:

Bahasa Indonesia (modified form of Malay; official); English and Dutch

leading foreign languages; local dialects, the most widely spoken of which

is Javanese

Literacy:

77% (male 84%, female 68%) age 15 and over can read and write (1990 est.)

Labor force:

67,000,000; agriculture 55%, manufacturing 10%, construction 4%, transport

and communications 3% (1985 est.)

Organized labor:

3,000,000 members (claimed); about 5% of labor force

:Indonesia Government

Long-form name:

Republic of Indonesia

Type:

republic

Capital:

Jakarta

Administrative divisions:

24 provinces (propinsi-propinsi, singular - propinsi), 2 special regions*

(daerah-daerah istimewa, singular - daerah istimewa), and 1 special capital

city district** (daerah khusus ibukota); Aceh*, Bali, Bengkulu, Irian Jaya,

Jakarta Raya**, Jambi, Jawa Barat, Jawa Tengah, Jawa Timur, Kalimantan

Barat, Kalimantan Selatan, Kalimantan Tengah, Kalimantan Timur, Lampung,

Maluku, Nusa Tenggara Barat, Nusa Tenggara Timur, Riau, Sulawesi Selatan,

Sulawesi Tengah, Sulawesi Tenggara, Sulawesi Utara, Sumatera Barat, Sumatera

Selatan, Sumatera Utara, Timor Timur, Yogyakarta*

Independence:

17 August 1945 (proclaimed independence; on 27 December 1949, Indonesia

became legally independent from the Netherlands)

Constitution:

August 1945, abrogated by Federal Constitution of 1949 and Provisional

Constitution of 1950, restored 5 July 1959

Legal system:

based on Roman-Dutch law, substantially modified by indigenous concepts and

by new criminal procedures code; has not accepted compulsory ICJ

jurisdiction

National holiday:

Independence Day, 17 August (1945)

Executive branch:

president, vice president, Cabinet

Legislative branch:

unicameral House of Representatives (Dewan Perwakilan Rakyat or DPR); note -

the People's Consultative Assembly (Majelis Permusyawaratan Rakyat or MPR)

includes the DPR plus 500 indirectly elected members who meet every five

years to elect the president and vice president and, theoretically, to

determine national policy

Judicial branch:

Supreme Court (Mahkamah Agung)

Leaders:

Chief of State and Head of Government:

President Gen. (Ret.) SOEHARTO (since 27 March 1968); Vice President Lt.

Gen. (Ret.) SUDHARMONO (since 11 March 1988)

Political parties and leaders:

GOLKAR (quasi-official party based on functional groups), Lt. Gen. (Ret.)

WAHONO, general chairman; Indonesia Democracy Party (PDI - federation of

former Nationalist and Christian Parties), SOERYADI, chairman; Development

Unity Party (PPP, federation of former Islamic parties), Ismail Hasan

METAREUM, chairman

Suffrage:

universal at age 17 and married persons regardless of age

Elections:

House of Representatives:

last held on 23 April 1987 (next to be held 8 June 1992); results - Golkar

73%, UDP 16%, PDI 11%; seats - (500 total - 400 elected, 100 appointed)

Golkar 299, UDP 61, PDI 40

Communists:

Communist Party (PKI) was officially banned in March 1966; current strength

about 1,000-3,000, with less than 10% engaged in organized activity;

pre-October 1965 hardcore membership about 1.5 million

:Indonesia Government

Member of:

APEC, AsDB, ASEAN, CCC, CP, ESCAP, FAO, G-15, G-19, G-77, GATT, IAEA, IBRD,

ICAO, ICC, ICFTU, IDA, IDB, IFAD, IFC, ILO, IMF, IMO, INMARSAT, INTELSAT,

INTERPOL, IOC, ISO, ITU, LORCS, NAM, OIC, OPEC, UN, UNCTAD, UNESCO, UNIDO,

UNIIMOG, UPU, WCL, WFTU, WHO, WIPO, WMO, WTO

Diplomatic representation:

Ambassador Abdul Rachman RAMLY; Chancery at 2020 Massachusetts Avenue NW,

Washington, DC 20036; telephone (202) 775-5200; there are Indonesian

Consulates General in Houston, New York, and Los Angeles, and Consulates in

Chicago and San Francisco

US:

Ambassador John C. MONJO; Embassy at Medan Merdeka Selatan 5, Jakarta

(mailing address is APO AP 96520); telephone [62] (21) 360-360; FAX [62]

(21) 360-644; there are US Consulates in Medan and Surabaya

Flag:

two equal horizontal bands of red (top) and white; similar to the flag of

Monaco, which is shorter; also similar to the flag of Poland, which is white

(top) and red

:Indonesia Economy

Overview:

Indonesia is a mixed economy with many socialist institutions and central

planning but with a recent emphasis on deregulation and private enterprise.

Indonesia has extensive natural wealth, yet, with a large and rapidly

increasing population, it remains a poor country. GDP growth in 1985-91

averaged about 6%, quite impressive, but not sufficient to both slash

underemployment and absorb the 2.3 million workers annually entering the

labor force. Agriculture, including forestry and fishing, is an important

sector, accounting for 23% of GDP and over 50% of the labor force. The

staple crop is rice. Once the world's largest rice importer, Indonesia is

now nearly self-sufficient. Plantation crops - rubber and palm oil - and

textiles and plywood are being encouraged for both export and job

generation. Industrial output now accounts for 30% of GDP and is based on a

supply of diverse natural resources, including crude oil, natural gas,

timber, metals, and coal. Of these, the oil sector dominates the external

economy, generating more than 20% of the government's revenues and 40% of

export earnings in 1989. However, the economy's growth is highly dependent

on the continuing expansion of nonoil exports. Japan is Indonesia's most

important customer and supplier of aid. In 1991, rapid growth in the money

supply prompted Jakarta to implement a tight monetary policy, forcing the

private sector to go to foreign banks for investment financing. Real

interest rates remained above 10%, off-shore commercial debt grew, and real

GDP growth dropped slightly from the 7% of 1990.

GDP:

exchange rate conversion - $122 billion, per capita $630; real growth rate

6.0% (1991 est.)

Inflation rate (consumer prices):

10% (1991 est.)

Unemployment rate:

3%; underemployment 45% (1991 est.)

Budget:

revenues $17.2 billion; expenditures $23.4 billion, including capital

expenditures of $8.9 billion (FY91)

Exports:

$25.7 billion (f.o.b., 1990)

commodities:

petroleum and liquefied natural gas 40%, timber 15%, textiles 7%, rubber 5%,

coffee 3%

partners:

Japan 40%, US 14%, Singapore 7%, Europe 16% (1990)

Imports:

$21.8 billion (f.o.b., 1990)

commodities:

machinery 39%, chemical products 19%, manufactured goods 16%

partners:

Japan 23%, US 13%, EC, Singapore

External debt:

$58.5 billion (1990 est.)

Industrial production:

growth rate 11.6% (1989 est.); accounts for 30% of GDP

Electricity:

11,600,000 kW capacity; 38,000 million kWh produced, 200 kWh per capita

(1990)

Industries:

petroleum, textiles, mining, cement, chemical fertilizers, plywood, food,

rubber

:Indonesia Economy

Agriculture:

accounts for 23% of GDP; subsistence food production; small-holder and

plantation production for export; main products are rice, cassava, peanuts,

rubber, cocoa, coffee, palm oil, copra, other tropical products, poultry,

beef, pork, eggs

Illicit drugs:

illicit producer of cannabis for the international drug trade, but not a

major player; government actively eradicating plantings and prosecuting

traffickers

Economic aid:

US commitments, including Ex-Im (FY70-89), $4.4 billion; Western (non-US)

countries, ODA and OOF bilateral commitments (1970-89), $25.9 billion; OPEC

bilateral aid (1979-89), $213 million; Communist countries (1970-89), $175

million

Currency:

Indonesian rupiah (plural - rupiahs); 1 Indonesian rupiah (Rp) = 100 sen

(sen no longer used)

Exchange rates:

Indonesian rupiahs (Rp) per US$1 - 1,998.2 (January 1992), 1,950.3 (1991),

1,842.8 (1990), 1,770.1 (1989), 1,685.7 (1988), 1,643.8 (1987)

Fiscal year:

1 April - 31 March

:Indonesia Communications

Railroads:

6,964 km total; 6,389 km 1.067-meter gauge, 497 km 0.750-meter gauge, 78 km

0.600-meter gauge; 211 km double track; 101 km electrified; all government

owned

Highways:

119,500 km total; 11,812 km state, 34,180 km provincial, and 73,508 km

district roads

Inland waterways:

21,579 km total; Sumatra 5,471 km, Java and Madura 820 km, Kalimantan 10,460

km, Celebes 241 km, Irian Jaya 4,587 km

Pipelines:

crude oil 2,505 km; petroleum products 456 km; natural gas 1,703 km (1989)

Ports:

Cilacap, Cirebon, Jakarta, Kupang, Palembang, Ujungpandang, Semarang,

Surabaya

Merchant marine:

387 ships (1,000 GRT or over) totaling 1,698,946 GRT/2,560,414 DWT; includes

5 short-sea passenger, 13 passenger-cargo, 231 cargo, 8 container, 3

roll-on/roll-off cargo, 3 vehicle carrier, 79 petroleum tanker, 5 chemical

tanker, 6 liquefied gas, 7 specialized tanker, 1 livestock carrier, 25 bulk,

1 passenger

Civil air:

about 216 commercial transport aircraft

Airports:

437 total, 410 usable; 114 with permanent-surface runways; 1 with runways

over 3,659 m; 12 with runways 2,440-3,659 m; 64 with runways 1,220-2,439 m

Telecommunications:

interisland microwave system and HF police net; domestic service fair,

international service good; radiobroadcast coverage good; 763,000 telephones

(1986); broadcast stations - 618 AM, 38 FM, 9 TV; satellite earth stations -

1 Indian Ocean INTELSAT earth station and 1 Pacific Ocean INTELSAT earth

station; and 1 domestic satellite communications system

:Indonesia Defense Forces

Branches:

Army, Navy, Air Force, National Police

Manpower availability:

males 15-49, 51,906,415; 30,668,815 fit for military service; 2,095,698

reach military age (18) annually

Defense expenditures:

exchange rate conversion - $1.7 billion, 2% of GNP (FY91)

:Iran Geography

Total area:

1,648,000 km2

Land area:

1,636,000 km2

Comparative area:

slightly larger than Alaska

Land boundaries:

5,440 km; Afghanistan 936 km, Armenia 35 km, Azerbaijan (north) 432 km,

Azerbaijan (northwest) 179 km, Iraq 1,458 km, Pakistan 909 km, Turkey 499

km, Turkmenistan 992 km

Coastline:

2,440 km

note:

Iran also borders the Caspian Sea (740 km)

Maritime claims:

Continental shelf:

not specific

Exclusive fishing zone:

50 nm in the Sea of Oman; continental shelf limit, continental shelf

boundaries, or median lines in the Persian Gulf

Territorial sea:

12 nm

Disputes:

Iran and Iraq restored diplomatic relations in 1990 but are still trying to

work out written agreements settling outstanding disputes from their

eight-year war concerning border demarcation, prisoners-of-war, and freedom

of navigation and sovereignty over the Shatt-al-Arab waterway; Iran occupies

two islands in the Persian Gulf claimed by the UAE: Tunb as Sughra (Arabic),

Jazireh-ye Tonb-e Kuchek (Persian) or Lesser Tunb, and Tunb al Kubra

(Arabic), Jazireh-ye Tonb-e Bozorg (Persian) or Greater Tunb; it jointly

administers with the UAE an island in the Persian Gulf claimed by the UAE,

Abu Musa (Arabic) or Jazireh-ye Abu Musa (Persian)

Climate:

mostly arid or semiarid, subtropical along Caspian coast

Terrain:

rugged, mountainous rim; high, central basin with deserts, mountains; small,

discontinuous plains along both coasts

Natural resources:

petroleum, natural gas, coal, chromium, copper, iron ore, lead, manganese,

zinc, sulfur

Land use:

arable land 8%; permanent crops NEGL%; meadows and pastures 27%; forest and

woodland 11%; other 54%; includes irrigated 2%

Environment:

deforestation; overgrazing; desertification

:Iran People

Population:

61,183,138 (July 1992), growth rate 3.5% (1992)

Birth rate:

44 births/1,000 population (1992)

Death rate:

8 deaths/1,000 population (1992)

Net migration rate:

0 migrants/1,000 population (1992)

Infant mortality rate:

64 deaths/1,000 live births (1992)

Life expectancy at birth:

64 years male, 66 years female (1992)

Total fertility rate:

6.5 children born/woman (1992)

Nationality:

noun - Iranian(s); adjective - Iranian

Ethnic divisions:

Persian 51%, Azerbaijani 25%, Kurd 9%, Gilaki and Mazandarani 8%, Lur 2%,

Baloch 1%, Arab 1%, other 3%

Religions:

Shi`a Muslim 95%, Sunni Muslim 4%, Zoroastrian, Jewish, Christian, and

Baha'i 1%

Languages:

58% Persian and Persian dialects, 26% Turkic and Turkic dialects, 9%

Kurdish, 2% Luri, 1% Baloch, 1% Arabic, 1% Turkish, 2% other

Literacy:

54% (male 64%, female 43%) age 15 and over can read and write (1990 est.)

Labor force:

15,400,000; agriculture 33%, manufacturing 21%; shortage of skilled labor

(1988 est.)

Organized labor:

none

:Iran Government

Long-form name:

Islamic Republic of Iran

Type:

theocratic republic

Capital:

Tehran

Administrative divisions:

24 provinces (ostanha, singular - ostan); Azarbayjan-e Bakhtari,

Azarbayjan-e Khavari, Bakhtaran, Bushehr, Chahar Machall va Bakhtiari,

Ecsfahan, Fars, Gilan, Hamadan, Hormozgan, Ilam, Kerman, Khorasan,

Khuzestan, Kohkiluyeh va Buyer Achmadi, Kordestan, Lorestan, Markazi,

Mazandaran, Semnan, Sistan va Baluchestan, Tehran, Yazd, Zanjan

Independence:

1 April 1979, Islamic Republic of Iran proclaimed

Constitution:

2-3 December 1979; revised 1989 to expand powers of the presidency and

eliminate the prime ministership

Legal system:

the Constitution codifies Islamic principles of government

National holiday:

Islamic Republic Day, 1 April (1979)

Executive branch:

cleric (faqih), president, Council of Ministers

Legislative branch:

unicameral Islamic Consultative Assembly (Majles-e-Shura-ye-Eslami)

Judicial branch:

Supreme Court

Leaders:

Cleric and functional Chief of State:

Leader of the Islamic Revolution Ayatollah Ali HOSEINI-KHAMENEI (since 4

June 1989)

Head of Government:

President Ali Akbar HASHEMI-RAFSANJANI (since 3 August 1989)

Political parties and leaders:

there are at least 18 licensed parties; the three most important are -

Tehran Militant Clergy Association, Mohammad Reza MAHDAVI-KANI; Militant

Clerics Association, Mehdi MAHDAVI-KARUBI and Mohammad Asqar

MUSAVI-KHOINIHA; Fedaiyin Islam Organization, Sadeq KHALKHALI

Suffrage:

universal at age 15

Elections:

President:

last held July 1989 (next to be held April 1993); results - Ali Akbar

HASHEMI-RAFSANJANI was elected with only token opposition

Islamic Consultative Assembly:

last held 8 April 1992 (next to be held April 1996); results - percent of

vote by party NA; seats - (270 seats total) number of seats by party NA

Communists:

1,000 to 2,000 est. hardcore; 15,000 to 20,000 est. sympathizers; crackdown

in 1983 crippled the party; trials of captured leaders began in late 1983

Other political or pressure groups:

groups that generally support the Islamic Republic include Hizballah,

Hojjatiyeh Society, Mojahedin of the Islamic Revolution, Muslim Students

Following the Line of the Imam; armed political groups that have been almost

completely repressed by the government include Mojahedin-e Khalq

Organization (MEK), People's Fedayeen, Kurdish Democratic Party; the Society

for the Defense of Freedom

:Iran Government

Member of:

CCC, CP, ESCAP, FAO, G-19, G-24, G-77, IAEA, IBRD, ICAO, ICC, IDA, IDB,

IFAD, IFC, ILO, IMF, IMO, INMARSAT, INTELSAT, INTERPOL, IOC, ISO, ITU,

LORCS, NAM, OIC, OPEC, PCA, UN, UNCTAD, UNESCO, UNHCR, UNIDO, UPU, WFTU,

WHO, WMO, WTO

Diplomatic representation:

none; protecting power in the US is Pakistan - Iranian Interests Section,

2315 Massachusetts Avenue NW, Washington, DC 20008; telephone (202) 939-6200

US:

protecting power in Iran is Switzerland

Flag:

three equal horizontal bands of green (top), white, and red; the national

emblem (a stylized representation of the word Allah) in red is centered in

the white band; Allah Alkbar (God is Great) in white Arabic script is

repeated 11 times along the bottom edge of the green band and 11 times along

the top edge of the red band

:Iran Economy

Overview:

Iran's economy is a mixture of central planning, state ownership of oil and

other large enterprises, village agriculture, and small-scale private

trading and service ventures. After a decade of economic decline, Iran's GNP

grew roughly 4% in FY90 and 10% in FY91. An oil windfall in 1990 combined

with a substantial increase in imports contributed to Iran's recent economic

growth. Iran has also begun implementing a number of economic reforms to

reduce government intervention (including subsidies) and has allocated

substantial resources to development projects in the hope of stimulating the

economy. Nevertheless, lower oil revenues in 1991 - oil accounts for more

than 90% of export revenues and provides roughly 65% of the financing for

the five-year economic development plan - and dramatic increases in external

debt are threatening development plans and could prompt Iran to cut imports,

thus limiting economic growth in the medium term.

GNP:

exchange rate conversion - $90 billion, per capita $1,500; real growth rate

10% (FY91 est.)

Inflation rate (consumer prices):

18% (FY91 est.)

Unemployment rate:

30% (1989)

Budget:

revenues $63 billion; expenditures $80 billion, including capital

expenditures of $23 billion (FY90 est.)

Exports:

$17.8 billion (f.o.b., 1990)

commodities:

petroleum 90%, carpets, fruits, nuts, hides

partners:

Japan, Italy, France, Netherlands, Belgium/Luxembourg, Spain, and Germany

Imports:

$15.9 billion (c.i.f., 1990)

commodities:

machinery, military supplies, metal works, foodstuffs, pharmaceuticals,

technical services, refined oil products

partners:

Germany, Japan, Italy, UK, France

External debt:

$10 billion (1990 est.)

Industrial production:

growth rate NA%

Electricity:

14,579,000 kW capacity; 40,000 million kWh produced, 740 kWh per capita

(1989)

Industries:

petroleum, petrochemicals, textiles, cement and other building materials,

food processing (particularly sugar refining and vegetable oil production),

metal fabricating (steel and copper)

Agriculture:

principal products - wheat, rice, other grains, sugar beets, fruits, nuts,

cotton, dairy products, wool, caviar; not self-sufficient in food

Illicit drugs:

illicit producer of opium poppy for the domestic and international drug

trade

Economic aid:

US commitments, including Ex-Im (FY70-80), $1.0 billion; Western (non-US)

countries, ODA and OOF bilateral commitments (1970-89), $1.675 billion;

Communist countries (1970-89), $976 million; note - aid fell sharply

following the 1979 revolution

:Iran Economy

Currency:

Iranian rial (plural - rials); 1 Iranian rial (IR) = 100 dinars; note -

domestic figures are generally referred to in terms of the toman (plural -

tomans), which equals 10 rials

Exchange rates:

Iranian rials (IR) per US$1 - 65.515 (January 1992), 67.505 (1991), 68.096

(1990), 72.015 (1989), 68.683 (1988), 71.460 (1987); note - black-market

rate 1,400 (January 1991)

Fiscal year:

21 March - 20 March

:Iran Communications

The 1992 CIA World Factbook · 第 36 / 95 段