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Sumatra (), is an island in western Indonesia, to the west of the Sunda Islands. It is the largest island that is entirely in Indonesia (two larger islands, Borneo and New Guinea, are shared between Indonesia and other countries) and the sixth largest island in the world at 473,481 km2 with a current population of almost 50 million (53 million administratively, as Riau Islands and Bangka–Belitung Islands are included). Its biggest city is Medan with over 4 million in the greater urban area.
Sumatra is an elongated landmass spanning a diagonal northwest-southeast axis. The Indian O...