Indonesia, officially the Republic of Indonesia, is a sovereign state in Southeast Asia and Oceania. Indonesia is an archipelago comprising 13,466 islands. It encompasses 33 provinces and 1 Special Administrative Region (for being governed by a pre-colonial monarchy) with over 238 million people, making it the world's fourth most populous country. Indonesia's republic form of government comprises an elected legislature and president. The nation's capital city is Jakarta. The country shares land borders with Papua New Guinea, East Timor, and Malaysia. Other neighboring countries include Singapore, the Philippines, Australia, Palau, and the Indian territory of the Andaman and Nicobar Islands. Indonesia is a founding member of ASEAN and a member of the G-20 major economies. The Indonesian economy is the world's 16th largest by nominal GDP.

The Indonesian archipelago has been an important trade region since at least the 7th century, when Srivijaya and then later Majapahit traded with China and India. Local rulers gradually absorbed foreign cultural, religious and political models from the early centuries CE, and Hindu and Buddhist kingdoms flourished. Indonesian history has been influenced by foreign powers drawn to its natural resources. Muslim traders brought the now-dominant Islam, while European powers brought Christianity and fought one another to monopolize trade in the Spice Islands of Maluku during the Age of Discovery. Following three and a half centuries of Dutch colonialism, Indonesia secured its independence after World War II. Indonesia's history has since been turbulent, with challenges posed by natural disasters, corruption, separatism, a democratization process, and periods of rapid economic change.

Indonesia consists of hundreds of distinct native ethnic and linguistic groups. The largest – and politically dominant – ethnic group are the Javanese. A shared identity has developed, defined by a national language, ethnic diversity, religious pluralism within a majority Muslim population, and a history of colonialism and rebellion against it. Indonesia's national motto, "Bhinneka Tunggal Ika" ("Unity in Diversity" literally, "many, yet one"), articulates the diversity that shapes the country. Despite its large population and densely populated regions, Indonesia has vast areas of wilderness that support the world's second highest level of biodiversity. The country has abundant natural resources, yet poverty remains widespread

Geography
Mount Semeru and Mount Bromo in East Java. Indonesia's seismic and volcanic activity is among the world's highest.Indonesia lies between latitudes 11°S and 6°N, and longitudes 95°E and 141°E. It consists of 17,508 islands, about 6,000 of which are inhabited. These are scattered over both sides of the equator. The largest are Java, Sumatra, Borneo (shared with Brunei and Malaysia), New Guinea (shared with Papua New Guinea), and Sulawesi. Indonesia shares land borders with Malaysia on Borneo, Papua New Guinea on the island of New Guinea, and East Timor on the island of Timor. Indonesia shares maritime borders across narrow straits with Singapore, Malaysia, the Philippines, and Palau to the north, and with Australia to the south. The capital, Jakarta, is on Java and is the nation's largest city, followed by Surabaya, Bandung, Medan, and Semarang.

At 1,919,440 square kilometers (741,050 sq mi), Indonesia is the world's 15th-largest country in terms of land area and world's 7th-largest country in terms of combined sea and land area. Its average population density is 134 people per square kilometer (347 per sq mi), 79th in the world, although Java, the world's most populous island, has a population density of 940 people per square kilometer (2,435 per sq mi). At 4,884 metres (16,024 ft), Puncak Jaya in Papua is Indonesia's highest peak, and Lake Toba in Sumatra its largest lake, with an area of 1,145 square kilometers (442 sq mi). The country's largest rivers are in Kalimantan, and include the Mahakam and Barito; such rivers are communication and transport links between the island's river settlements.

Lying along the equator, Indonesia has a tropical climate, with two distinct monsoonal wet and dry seasons. Average annual rainfall in the lowlands varies from 1,780–3,175 millimeters (70.1–125.0 inches), and up to 6,100 millimeters (240 inches) in mountainous regions. Mountainous areas – particularly in the west coast of Sumatra, West Java, Kalimantan, Sulawesi, and Papua – receive the highest rainfall. Humidity is generally high, averaging about 80%. Temperatures vary little throughout the year; the average daily temperature range of Jakarta is 26–30 °C (79–86 °F).

Economy
Using water buffalo to plough rice fields in Java. Agriculture had been the country's largest employer for centuries.Indonesia has a mixed economy in which both the private sector and government play significant roles. The country is the largest economy in Southeast Asia and a member of the G-20 major economies. Indonesia's estimated gross domestic product (nominal), as of 2012 was US$928.274 billion with estimated nominal per capita GDP was US$3,797, and per capita GDP PPP was US$4,943 (international dollars). The gross domestic product (GDP) is about $1 trillion and the debt ratio to the GDP is 26%. According to World Bank affiliated report based on 2011 data, the Indonesian economy was the world's 10th largest by nominal GDP (PPP based), with the country contributing 2.3 percent of global economic output. The industry sector is the economy's largest and accounts for 46.4% of GDP (2012), this is followed by services (38.6%) and agriculture (14.4%). However, since 2012, the service sector has employed more people than other sectors, accounting for 48.9% of the total labor force, this has been followed by agriculture (38.6%) and industry (22.2%). Agriculture, however, had been the country's largest employer for centuries.

According to World Trade Organization data, Indonesia was the 27th biggest exporting country in the world in 2010, moving up three places from a year before. Indonesia's main export markets (2009) are Japan (17.28%), Singapore (11.29%), the United States (10.81%), and China (7.62%). The major suppliers of imports to Indonesia are Singapore (24.96%), China (12.52%), and Japan (8.92%). In 2005, Indonesia ran a trade surplus with export revenues of US$83.64 billion and import expenditure of US$62.02 billion. The country has extensive natural resources, including crude oil, natural gas, tin, copper, and gold. Indonesia's major imports include machinery and equipment, chemicals, fuels, and foodstuffs. And the country's major export commodities include oil and gas, electrical appliances, plywood, rubber, and textiles. Jakarta, the capital of Indonesia and the country's largest commercial center.The tourism sector contributes to around US$9 billion of foreign exchange in 2012, and ranked as the 4th largest among goods and services export sectors. Singapore, Malaysia, Australia, China and Japan are the top five source of visitors to Indonesia.

Demographics
There are around 300 distinct native ethnic groups in Indonesia, and 742 different languages and dialects. Most Indonesians are descended from Austronesian-speaking peoples whose languages can be traced to Proto-Austronesian (PAn), which possibly originated in Taiwan. Another major grouping are Melanesians, who inhabit eastern Indonesia. The largest ethnic group is the Javanese, who comprise 42% of the population, and are politically and culturally dominant. The Sundanese, ethnic Malays, and Madurese are the largest non-Javanese groups. A sense of Indonesian nationhood exists alongside strong regional identities. Society is largely harmonious, although social, religious and ethnic tensions have triggered horrendous violence. Chinese Indonesians are an influential ethnic minority comprising 3–4% of the population. Much of the country's privately owned commerce and wealth is Chinese-Indonesian-controlled. Chinese businesses in Indonesia are part of the larger bamboo network, a network of overseas Chinese businesses operating in the markets of Southeast Asia that share common family and cultural ties. This has contributed to considerable resentment, and even anti-Chinese violence.