Siak River

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Sungai Siak, Pekanbaru.jpg
The Siak River as it flows through Pekanbaru
Country Indonesia
Physical characteristics
Main source 0 m (0 ft)
River mouth Malacca Strait
Length 370 km (230 mi)

The Siak (Sungai Siak) is a river of Riau province, in the east of Sumatra, Indonesia, approximately 370 kilometres in length. The Siak is a blackwater river which owes its brown color to dissolved organic matter (DOM) leached from surrounding, heavily disturbed peat soils; it is heavily polluted, notably by the petroleum industry. It flows through the town of Pekanbaru before emptying into the Strait of Malacca.[1]


  1. ^ John William Reed, John William King (1867). The China sea directory, Volume 1, Hydrographic Dept. Hydrographic office, Admiralty. 

Coordinates: 1°14′16″N 102°10′00″E / 1.23778°N 102.16667°E / 1.23778; 102.16667

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