Indonesia is a country in Southeast Asia. Comprising 17,508 islands, it is the world's largest archipelagic state. With a population of 222 million people in 2006, it is the world's fourth most populous country and the most populous Muslim-majority nation. The nation's capital city is Jakarta. Indonesia consists of distinct ethnic, linguistic, and religious groups. The five largest islands are Java, Sumatra, Kalimantan (the Indonesian part of Borneo), New Guinea (shared with Papua New Guinea), and Sulawesi. Indonesia has around 300 ethnic groups, each with cultural differences developed over centuries, and influenced by Indian, Arabic, Chinese, Malay, and European sources.