Siak River
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| Siak Sungai Siak | |
|---|---|
 The Siak River flowing through the town of Siak Sri Indrapura. | |
  Location of river mouth  Siak River (Indonesia) | |
| Location | |
| Country | Indonesia |
| Province | Riau |
| Physical characteristics | |
| Source | |
| • elevation | 0 m (0 ft) |
| Mouth | Malacca Strait |
| Length | 370 km (230 mi) |
| Basin size | 10,423 km2 (4,024 mi2)[1] |
| Discharge | |
| • location | Siak Delta, Malacca Strait |
| • average | (Period of data: 2009–2013)720 m3/s (25,000 cu ft/s)[1] |
The Siak is a major river of Riau province, in the east of Sumatra, Indonesia, about 1000 km northwest of the capital Jakarta.[2] 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 city of Pekanbaru and other large towns such as Siak Sri Indrapura before emptying into the Strait of Malacca.[3]
