Sumatra is part of which country?
State of East Sumatra North Sumatra on August 15, 1950. State of East Sumatra The State of East Sumatra ("Negara Sumatera Timur") was established by the Netherlands after the reoccupation of North Sumatra in July, 1947, during the first of the Dutch "police actions" against the fledgling Republic of Indonesia. In 1949, as part of a peace deal that concluded the Indonesian National Revolution, it joined the United States of Indonesia, of which the Republic was also a component state. In August, 1950, it was finally absorbed into the Republic as part of the province of North Sumatra. Today, the part of East Sumatra
Sumatra Trench in the reducing of the sediment thickness. The thickness is minimum at South Sumatra (1–2 km) and maximum at north Sumatra. The thickest sediment at north Sumatra can compare with the Makran Trench, which has the thickest sediment on Earth (7.5 km). Sediment thickness along the Sumatra Trench varies significantly, which is the result of fracture zones and fossil ridges' influence on basement topography. The thickness is a function of oceanic basement topography in some extent and this feature is extremely distinctive in the part between Simeulue and Siberut Islands (Central Sumatra region 2°N to 3°S) along the trench. This