Deli River
Deli River is a river located in Sumatra, Indonesia, and reaches the Malacca Strait through the northern part of the city of Medan before discharging into the Strait near the port city of Belawan. It is one of the eight rivers in the Medan area. The Deli Sultanate was founded on the delta of the river around 1640, and later around the 19th century, this river acted as an artery of trade for the sultanate to other areas.
Hydrology
The forest area in the headwaters of the Deli River is 3,655 hectares, or 7.59 percent of 48 162 hectares of the Deli watershed. With an area of 48,162 hectares, a length of 73 kilometres, and a width of 5.58 m, the Deli watershed should have at least 14,000 hectares, or 30 percent of the watershed.Today, the river is heavily polluted. 70 percent of waste in the Deli River are solid or liquid waste, due to waste generated in the densely populated city of Medan.