Sumatra (also Sumatera) is an island in western Indonesia and part of the Sunda Islands. It is the thirth largest island in Indonesia (after Borneo and New Guinea) and the sixth largest island in the world at 480.847.74 km2 (including adjacent islands such as Riau islands and Bangka Belitung islands). Its biggest city is Medan. Wild and rugged, Sumatra is blend of Mother Nature extremes, blessed with natural wealth as well as proneness to natural disasters. Volcano eruptions, earthquakes, tsunami, and landslides are common headline grabbers of this one of the world's richest ecosystem. But nobody can deny Sumatra's beauty from the top of majestic volcanoes to the lush of the jungles and down at sea level, where idyllic deserted beaches are scattered along the island.