where is sumatra
Sumatra (Sumatera) World's sixth largest island, in w Indonesia. The largest cities (pop. 1990) are Medan (1,685,972), Palembang (1,084,483), and Padang (477,344). Sumatra's w coast is rugged and mountainous, the Barisan Mountains rising to 3810m (12,500ft), and nearly 60% of the lowland area is jungle.