Geography of Indonesia

Indonesia is an archipelagic island country in Southeast Asia, lying between the Indian Ocean and the Pacific Ocean. It is in a strategic location astride or along major sea lanes from Indian Ocean to Pacific Ocean. The country's variations in culture have been shaped—although not specifically determined—by centuries of complex interactions with the physical environment. Although Indonesians are now less vulnerable to the vicissitudes of nature as a result of improved technology and social programs, to some extent their social diversity has emerged from traditionally different patterns of adjustment to their physical circumstances.

Geographic regions

Indonesia is an archipelagic country extending 5,120 kilometers from east to west and 1,760 kilometers from north to south. It encompasses and estimated 17,508 islands, only 6,000 of which are inhabited. It comprises five main islands; Sumatra, Java, Borneo (known as "Kalimantan" in Indonesia), Sulawesi, and New Guinea; two major archipelagos (Nusa Tenggara and the Maluku Islands); and sixty smaller archipelagos. Three of the islands are shared with other nations; Borneo is shared with Malaysia and Brunei, Timor is shared with East Timor, and the newly divided provinces of Papua and West Papua share the island of New Guinea with Papua New Guinea. Indonesia's total land area is 1,919,317 square kilometers. Included in Indonesia's total territory is another 93,000 square kilometers of inlands seas (straits, bays, and other bodies of water). The additional surrounding sea areas bring Indonesia's generally recognized territory (land and sea) to about 5 million square kilometers. The government, however, also claims an exclusive economic zone, which brings the total to about 7.9 million square kilometers.

Geographers have conventionally grouped Sumatra, Java (and Madura), Kalimantan (in Borneo island), and Sulawesi in the Greater Sunda Islands. These islands, except for Sulawesi, lie on the Sunda Shelf—an extension of the Malay Peninsula and the Southeast Asian mainland. At Indonesia's eastern extremity is Papua, which takes up the western half of the world's second largest island--New Guinea--on the Sahul Shelf. Sea depths in the Sunda and Sahul shelves average 200 meters or less. Between these two shelves lie Sulawesi, Nusa Tenggara (also known as the Lesser Sunda Islands), and the Maluku Islands (or the Moluccas), which form a second island group where the surrounding seas in some places reach 4,500 meters in depth. The term Outer Islands is used inconsistently by various writers but it is usually taken to mean those islands other than Java and Madura.

[
Volcanoes in Indonesia] Tectonically, this region--especially Java--is highly unstable, and although the volcanic ash has resulted in fertile soils, it makes agricultural conditions unpredictable in some areas. The country has numerous mountains and some 400 volcanoes, of which approximately 150cite web|url=http://www.volcano.si.edu/world/region.cfm?rnum=06&rpage=list| title=Volcanoes of Indonesia| publisher=Smithsonian Institution| accessdate=2007-03-25| work=Global Volcanism Program] are active. Between 1972 and 1991 alone, twenty-nine volcanic eruptions were recorded, mostly on Java. The most violent volcanic eruptions in modern times occurred in Indonesia. In 1815 a volcano at Gunung Tambora on the north coast of Sumbawa, Nusa Tenggara Barat Province, claimed 92,000 lives and created "the year without a summer" in various parts of the world. In 1883 Krakatau in the Sunda Strait, between Java and Sumatra, erupted and some 36,000 West Javans died from the resulting tidal wave. The sound of the explosion was reported as far away as Turkey and Japan. For almost a century following that eruption, Krakatau was quiet, until the late 1970s, when it erupted twice.

Mountains ranging between 3,000 and 3,800 meters above sea level can be found on the islands of Sumatra, Java, Bali, Lombok, Sulawesi, and Seram. The country's tallest mountains are located in the Jayawijaya Mountains and the Sudirman Mountains in Papua. The highest peak, Puncak Jaya, also known as Mount Carstenz, which reaches 4,884 meters, is located in the Sudirman Mountains.

Nusa Tenggara consists of two strings of islands stretching eastward from Bali toward Papua. The inner arc of Nusa Tenggara is a continuation of the chain of mountains and volcanoes extending from Sumatra through Java, Bali, and Flores, and trailing off in the Banda Islands. The outer arc of Nusa Tenggara is a geological extension of the chain of islands west of Sumatra that includes Nias, Mentawai, and Enggano. This chain resurfaces in Nusa Tenggara in the ruggedly mountainous islands of Sumba and Timor.

The Maluku Islands (or Moluccas) are geologically among the most complex of the Indonesian islands. They are located in the northeast sector of the archipelago, bounded by the Philippines to the north, Papua to the east, and Nusa Tenggara to the south. The largest of these islands include Halmahera, Seram and Buru, all of which rise steeply out of very deep seas. This abrupt relief pattern from sea to high mountains means that there are very few level coastal plains.

Geographers believe that the island of New Guinea, of which Papua is a part, may once have been part of the Australian continent. The breakup and tectonic action created both towering, snowcapped mountain peaks lining its central east-west spine and hot, humid alluvial plains along the coast of New Guinea. Papua's mountains range some 650 kilometers east to west, dividing the region between north and south.

Time Zones

The archipelago stretches across three time zones: Western Indonesian Time--seven hours in advance of Greenwich Mean Time (GMT)--includes Sumatra, Java, and eastern Kalimantan; Central Indonesian Time--eight hours head of GMT--includes western Kalimantan, Nusa Tenggara, and Sulawesi; and Eastern Indonesian Time--nine hours ahead of GMT-- includes the Malukus and Papua. The boundary between the western and central time zones--established in 1988--is a line running north between Java and Bali through the center of Kalimantan. The border between central and eastern time zones runs north from the eastern tip of Timor to the eastern tip of Sulawesi.

Climate

The main variable of Indonesia's climate is not temperature or air pressure, but rainfall. The almost uniformly warm waters that make up 81 % of Indonesia's area ensure that temperatures on land remain fairly constant. Split by the equator, the archipelago is almost entirely tropical in climate, with the coastal plains averaging 28 °C, the inland and mountain areas averaging 26 °C, and the higher mountain regions, 23 °C. The area's relative humidity ranges between 70 and 90 %. Winds are moderate and generally predictable, with monsoons usually blowing in from the south and east in June through September and from the northwest in December through March. Typhoons and large scale storms pose little hazard to mariners in Indonesia waters; the major danger comes from swift currents in channels, such as the Lombok and Sape straits.

Located on the equator, the archipelago experiences relatively little change in the length of daylight hours from one season to the next; the difference between the longest day and the shortest day of the year is only forty-eight minutes. The archipelago stretches across three time zones: Western Indonesian Time--seven hours in advance of Greenwich Mean Time (GMT)--includes Sumatra, Java, and eastern Kalimantan; Central Indonesian Time--eight hours head of GMT--includes western Kalimantan, Nusa Tenggara, and Sulawesi; and Eastern Indonesian Time--nine hours ahead of GMT-- includes the Malukus and Papua. The boundary between the western and central time zones--established in 1988--is a line running north between Java and Bali through the center of Kalimantan. The border between central and eastern time zones runs north from the eastern tip of Timor to the eastern tip of Sulawesi.

Environmental issues in Indonesia

For centuries, the geographical resources of the Indonesian archipelago have been exploited in ways that fall into consistent social and historical patterns. One cultural pattern consists of the formerly Indianized, rice-growing peasants in the valleys and plains of Sumatra, Java, and Bali; another cultural complex is composed of the largely Islamic coastal commercial sector; a third, more marginal sector consists of the upland forest farming communities which exist by means of subsistence swidden agriculture. To some degree, these patterns can be linked to the geographical resources themselves, with abundant shoreline, generally calm seas, and steady winds favoring the use of sailing vessels, and fertile valleys and plains--at least in the Greater Sunda Islands--permitting irrigated rice farming. The heavily forested, mountainous interior hinders overland communication by road or river, but fosters slash-and-burn agriculture.

Each of these patterns of ecological and economic adaptation experienced tremendous pressures during the 1970s and 1980s, with rising population density, soil erosion, river-bed siltation, and water pollution from agricultural pesticides and off-shore oil drilling. In the coastal commercial sector, for instance, the livelihood of fishing people and those engaged in allied activities--roughly 5.6 million people--began to be imperiled in the late 1970s by declining fish stocks brought about by the contamination of coastal waters. Fishermen in northern Java experienced marked declines in certain kinds of fish catches and by the mid-1980s saw the virtual disappearance of the terburuk fish in some areas. Effluent from fertilizer plants in Gresik in northern Java polluted ponds and killed milkfish fry and young shrimp. The pollution of the Strait of Malacca between Malaysia and Sumatra from oil leakage from the Japanese supertanker Showa Maru in January 1975 was a major environmental disaster for the fragile Sumatran coastline. The danger of supertanker accidents also increased in the heavily trafficked strait.

National territory: rights and responsibilities

The legal responsibility for Indonesia's environment continued to be a matter of controversy in the early 1990s. Among the continuing concerns were those expressed in 1982 during the UN Conference on the Law of the Sea. In this conference, Indonesia sought to defend its March 1980 claim to a 200 nautical mile (370 km) exclusive economic zone. Based on the doctrine of the political and security unity of archipelagic land and sea space (wawasan nusantara), the government asserted its rights to marine and geological resources within this coastal zone. In all, the area claimed by the government, including the exclusive economic zone, was 7.9 million square kilometers. Indonesia also claimed as its territory all sea areas within a maritime belt of twelve nautical miles (22 km) of the outer perimeter of its islands. All straits, bays, and waters within this belt were considered inland seas by the government and amounted to around 93,000 square kilometers. The Strait of Malacca--one of the most heavily traveled sea-lanes in the world--was considered by Indonesia and Malaysia to be their joint possession, and the two countries requested that other nations notify their governments before moving warships through these waters. The United States and several other nations rejected those claims, considering the strait an international waterway.

During the 1980s and early 1990s, Indonesia was involved in territorial disputes. One controversy concerned Indonesia's annexation (with blessing from the U.S. and Australia) of the former colony of Portuguese Timor as Timor Timur Province in 1976, an action which came under protest in the UN and among human rights activists.

Another dispute involved Indonesia's conflict with Australia over rights to the continental shelf off the coast of Timor. This problem was resolved in 1991 by a bilateral agreement calling for joint economic exploitation of the disputed area in the so-called "Timor Gap." Still other controversies arose regarding overflight rights in Papua (disputed with Papua New Guinea) and conflicting claims to the Spratly Islands in the South China Sea by Brunei, China, Malaysia, the Philippines, Taiwan and Vietnam. Indonesia played the role of mediator in the Spratly Islands controversy.

Even as Indonesia extended its claim to territory, international environmental groups were pressing Jakarta to accept environmental responsibility for those territories. Indonesia was encouraged to monitor pollution in its territorial waters and take legal action to prevent the destruction of its rain forests. Since the late 1960s, the government addressed increasing environmental problems by establishing resource management programs, conducting environmental impact analyses, developing better policy enforcement, and enacting appropriate laws to give government officials proper authority. Despite these efforts, overlapping competencies among government departments and legal uncertainties about which department had what authority slowed progress made against environmental degradation.

Area and boundaries

Area:
"total:" 1,919,440 km²
"land:" 1,826,440 km²
"water:" 93,000 km²

Land boundaries:
"total:" 2,830 km
"border countries:" Malaysia 1,782 km, Papua New Guinea 820 km, East Timor 228 km
"Other nearby countries:" India NW of Acheh, Australia, Singapore, Philippines, Brunei.

Coastline: 54,716 km

Maritime claims: measured from claimed archipelagic baselines
"exclusive economic zone:" 200 nautical miles (370 km)
"territorial sea:" 12 nautical miles (22 km)

Elevation extremes:
"lowest point:" Indian Ocean 0 m(sea surface level), Wetar Basin in east of Banda Sea at -7,440 m (northwest of Tanimbar Islands & southeast of Ceram Island), where subduction zone is
"highest point:" Puncak Jaya (also known as "Carstenz Pyramid") 4 884 m

Resources and land use

Natural resources: petroleum, tin, natural gas, nickel, timber, bauxite, copper, fertile soils, coal, gold, silver

Land use:
"arable land:" 9.9%
"permanent crops:" 7.2%
"other:" 82.9% (1998 est.)

Irrigated land: 48,150 km² (1998 est.)

See also

* Indonesia
* List of cities in Indonesia
* List of volcanoes in Indonesia

References

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