Sumatra is an island in western Indonesia. It is the largest island in entire Indonesia (two larger islands, Borneo and New Guinea, are shared between Indonesia and other countries), and the sixth largest island in the world. North Sumatra (Indonesian: Sumatera Utara) is a province on the Sumatra island. Its capital is Medan. The province stretches across the island of Sumatra between the Indian Ocean and the Strait Malacca. It borders Aceh province on the north west and Riau and West Sumatra provinces in the south east. The island includes more than 10 National Parks, including 3 which are listed as the Tropical Rainforest Heritage of Sumatra World Heritage Site—Gunung Leuser National Park, Kerinci Seblat National Park and Bukit Barisan Selatan National Park. The island is home to 201 mammal species and 580 bird species. Sumatra has a huge range of plant and animal species but has lost almost 50% of its tropical rainforest in the last 35 years and many species are Critically Endangered such as Sumatran Tiger, Sumatran Rhino and Sumatran Orangutan. The people represent many different ethnic groups, speaking 52 different languages. Most of these groups, however, share many similar traditions and the different tongues are closely related. 87% of Sumatrans are thought to be Muslim with 10% Christian, 2% Buddhist and 1% Hindu. Malay-speaking people dominate the eastern coast, while people in the southern and central interior speak languages related to Malay, such as the Lampung and Minangkabau people. The highlands of northern Sumatra is inhabited by the Bataks, while the northernmost coast is dominated by Acehs. Ethnic Chinese minorities are also present in urban centers.