This FAPAR image shows the vegetation index of Sumatra (below), an island in western Indonesia, westernmost of the Sunda Islands, and of southern Malaysia (above). The two are separated by the Strait of Malacca. The vegetation index ranges from good (green) to high (rusty red), although it is generally higher along the coastlines of the two countries.
The longest axis of Sumatra runs approximately 1,790 km (1,110 mi) northwest–southeast, crossing the equator near the centre. At its widest point the island spans 435 km (270 mi). The interior of the island is dominated by two geographical regions: the Barisan Mountains in the west and swampy plains in the east.