Siak River
The 883rd longest river in the world
The Siak is a major river of Riau province, in the east of Sumatra, Indonesia, about 1000 km northwest of the capital Jakarta. 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.
Flows through: Indonesia.
River data from Wikidata (CC0); lengths normalised to a common unit.