Indonesia, officially the Republic of Indonesia, is a nation located between the Indian and Pacific oceans in Southeast Asia and Oceania. It covers an area of 1,904,569 square kilometers and is made up of over seventeen thousand islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea. At 1,904,569 square kilometers, Indonesia is the world's largest island nation and the 14th-largest country by land area. Indonesia is the world's fourth-most populous country and the world's most populous Muslim-majority country, with over 270 million inhabitants. More than half of the country's population lives on Java, the world's most populated island. Indonesia is a presidential republic with a democratically elected legislature. It is divided into 34 provinces, five of which have special status. Jakarta, the country's capital, is the world's second-most populous city. Papua New Guinea, East Timor, and the eastern part of Malaysia share land boundaries with the region. Singapore, Vietnam, the Philippines, Australia, Palau, and India are among the country's neighbors. Despite its large population and densely populated regions, Indonesia has vast swaths of wilderness that sustain some of the world's most diverse ecosystems. Since at least the 7th century, when Srivijaya and later Majapahit traded with entities from mainland China and the Indian subcontinent, the Indonesian archipelago has been a valuable trading area. From the early centuries, local rulers gradually absorbed foreign powers, and Hindu and Buddhist kingdoms flourished. Islam was brought by Sunni merchants and Sufi scholars, while Christianity was mainly brought by European explorers. The Dutch were the most powerful imperial force in the archipelago for much of their 350-year presence, despite interruptions from the Portuguese, French, and British. In the early twentieth century, the idea of "Indonesia" as a nation-state arose, resulting in the declaration of Indonesian independence in 1945. However, after an armed and political dispute, it was not until 1949 that the Dutch acknowledged Indonesia's sovereignty. Indonesia is home to hundreds of ethnic and linguistic communities, the most populous of which is the Javanese. With the slogan "Bhinneka Tunggal Ika," a common identity has emerged, characterized by a national language, ethnic diversity, religious pluralism within a Muslim-majority community, and a history of colonialism and resistance to it. Indonesia has the 16th largest nominal GDP and the 7th largest PPP economy in the world. It is a regional force and a middle power in international relations. The country is a founding member of the Non-Aligned Movement, Association of Southeast Asian Nations, East Asia Summit, and Organization of Islamic Cooperation, as well as a member of the United Nations, World Trade Organization, and G20.