The earliest known mention of the current form "Sumatra" was in 1017, when the local king Haji Sumatrabhumi ("king of the land of Sumatra") sent an envoy to China. Sumatra was known in ancient times by the Sanskrit names of Suwarnadwīpa ('Island of Gold') and Suwarnabhūmi ('Land of Gold'), because of the gold deposits in the island's highlands. Deforestation on the island has also resulted in serious seasonal smoke haze over neighbouring countries, such as the 2013 Southeast Asian haze which caused considerable tensions between Indonesia and affected countries Malaysia and Singapore. Many species are now critically endangered, such as the Sumatran ground cuckoo, the Sumatran tiger, the Sumatran elephant, the Sumatran rhinoceros, and the Sumatran orangutan. Sumatra has a wide range of plant and animal species but has lost almost 50% of its tropical rainforest in the last 35 years. Lush tropical rain forest once dominated the landscape. The climate of the island is tropical, hot, and humid. The equator crosses the island at its centre in West Sumatra and Riau provinces. The Bukit Barisan mountains, which contain several active volcanoes, form the backbone of the island, while the northeastern area contains large plains and lowlands with swamps, mangrove forest and complex river systems. The northern tip of Sumatra is near the Andaman Islands, while off the southeastern coast lie the islands of Bangka and Belitung, Karimata Strait and the Java Sea. In the southeast, the narrow Sunda Strait, containing the Krakatoa Archipelago, separates Sumatra from Java. In the northeast, the narrow Strait of Malacca separates the island from the Malay Peninsula, which is an extension of the Eurasian continent. The Indian Ocean borders the northwest, west, and southwest coasts of Sumatra, with the island chain of Simeulue, Nias, Mentawai, and Enggano off the western coast.
Sumatra is an elongated landmass spanning a diagonal northwest–southeast axis. 2), including adjacent islands such as the Simeulue, Nias, Mentawai, Enggano, Riau Islands, Bangka Belitung and Krakatoa archipelago. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 475,807.63 km 2 (182,812 mi.
Sumatra is one of the Sunda Islands of western Indonesia.
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