Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania. Indonesia comprises 17,000 islands. It is the world's fourth most populous country. Indonesia is a republic, with an elected legislature and president. The nation's capital city is Jakarta. The Indonesian archipelago has been an important trade region since at least the 7th century. Across its many islands, Indonesia consists of distinct ethnic, linguistic, and religious groups. The Javanese are the largest—and the politically dominant—ethnic group. Indonesia has developed a shared identity defined by a national language, ethnic diversity, religious pluralism. Administratively, Indonesia consists of 33 provinces, five of which have special status. Each province has its own political legislature and governor. Indonesia consists of 17,508 islands. The largest are Java, Sumatra, Borneo (shared with Brunei and Malaysia), New Guinea (shared with Papua New Guinea), and Sulawesi. Lying along the equator, Indonesia has a tropical climate, with two distinct monsoonal wet and dry seasons. Temperatures vary little throughout the year; the average daily temperature range of Jakarta is 26–30 °C. Indonesia's size, tropical climate, and archipelagic geography, support the world's second highest level of biodiversity (after Brazil), and its flora and fauna is a mixture of Asian and Australasian species. 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. The official national language, Indonesian, is universally taught in schools, and consequently is spoken by nearly every Indonesian. It is the language of business, politics, national media, education, and academia. Indonesia has around 300 ethnic groups, each with cultural identities developed over centuries, and influenced by Indian, Arabic, Chinese, and European sources. Indonesian cuisine varies by region and is based on Chinese, European, Middle Eastern, and Indian precedents. Rice is the main staple food and is served with side dishes of meat and vegetables. Spices (notably chili), coconut milk, fish and chicken are fundamental ingredients.