Rajang River

The Rajang River (Malay: Batang Rajang) is a river in Sarawak, northwest Borneo, Malaysia. The river originates in the Iran Mountains, flows through Kapit, and then towards the South China Sea. At approximately 565 km long (351 mi), the river is the seventh-longest in Borneo and the longest in Malaysia.

Rajang
Rejang, 拉让江
The Rajang drainage basin
Nickname(s)Swan river (Chinese community)
Location
CountryMalaysia
StateSarawak
Physical characteristics
SourceIran Mountains
  locationMalaysia
  elevation2,074 m (6,804 ft)
Mouth 
  location
South China Sea, Malaysia
  elevation
0 m (0 ft)
Length770 km (480 mi)
Basin size50,707 km2 (19,578 sq mi)
Depth 
  minimum2
  maximum45
Discharge 
  locationRajang Delta, South China Sea
  average3,600 m3/s (130,000 cu ft/s)

(Period of data: 2003-2016)4,715 m3/s (166,500 cu ft/s)

124.826 km3/a (3,955.5 m3/s)
  minimum1,000 m3/s (35,000 cu ft/s)
  maximum6,000 m3/s (210,000 cu ft/s) 25,000 m3/s (880,000 cu ft/s)
Discharge 
  locationKapit, Malaysia (Basin size: 34,053 km2 (13,148 sq mi))
  average(Period of data: 1983-1990)2,510 m3/s (89,000 cu ft/s)
  minimum305 m3/s (10,800 cu ft/s)
  maximum10,799 m3/s (381,400 cu ft/s)
Discharge 
  locationSibu, Malaysia (Basin size: 43,550.5 km2 (16,814.9 sq mi)
  average(Period of data: 1992-2016)3,355 m3/s (118,500 cu ft/s)
Basin features
Tributaries 
  leftBelaga
  rightBaleh, Balui, Katibas

Malaysia's largest and tallest (160m) hydro electric project, the Bakun Hydro Electric Dam, is located on the Balui River, a tributary of the Rajang. Other important tributaries include the Katibas River, Ngemah River, Iran River, Pila River, Balleh River, Bangkit River and the Kanowit River.

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