The Siak (Sungai Siak) is a river of
Riau
Riau (Jawi script, Jawi: ) is a Provinces of Indonesia, province of Indonesia. It is located on the central eastern coast of the island of Sumatra, and extends from the eastern slopes of the Barisan Mountains to the Malacca Strait, including s ...
province, in the east of
Sumatra
Sumatra () is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the list of islands by area, sixth-largest island in the world at 482,286.55 km2 (182,812 mi. ...
,
Indonesia
Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...
, about 1000 km northwest of the capital
Jakarta
Jakarta (; , Betawi language, Betawi: ''Jakartè''), officially the Special Capital Region of Jakarta (; ''DKI Jakarta'') and formerly known as Batavia, Dutch East Indies, Batavia until 1949, is the capital and largest city of Indonesia and ...
. Approximately 370 kilometres in length, the Siak is a
blackwater river
A blackwater river is a type of River#Classification, river with a slow-moving channel flowing through forested swamps or wetlands. Most major blackwater rivers are in the Amazon Basin and the Southern United States. The term is used in fluvial ...
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
Pekanbaru is the capital city of the Indonesian province of Riau, and a major economic center on the eastern side of Sumatra, Sumatra Island with its name derived from the Malay language, Malay (Indonesian language, Indonesian) word for 'new mar ...
before emptying into the
Strait of Malacca
The Strait of Malacca is a narrow stretch of water, long and from wide, between the Malay Peninsula to the northeast and the Indonesian island of Sumatra to the southwest, connecting the Andaman Sea (Indian Ocean) and the South China Sea (Pa ...
.
Geography
The river flows in the central area of Sumatra with predominantly
tropical rainforest climate
A tropical rainforest climate or equatorial climate is a tropical climate sub-type usually found within 10 to 15 degrees latitude of the equator. There are some other areas at higher latitudes, such as the coast of southeast Florida, United States ...
(designated as ''Af'' in the Köppen-Geiger climate classification).
The annual average temperature in the area is 23 °C. The warmest month is October, when the average temperature is around 25 °C, and the coldest is January, at 22 °C.
The average annual rainfall is 2673 mm. The wettest month is November, with an average of 418 mm rainfall, and the driest is January, with 106 mm rainfall.
See also
*
List of drainage basins of Indonesia
This is a list of river catchment areas, also known as drainage basins, in Indonesia.
Based on the National River Basin Classification map, Indonesia has a total of 42,210 river basins organized as a basis for determining watershed management poli ...
*
List of rivers of Indonesia
This is a list of rivers in Indonesia.''Map of Indonesia''. Peta Indonesia. Wawasan Nusantara. CV. Indo Prima Sarana. Accessed 29 Juli 2017.
By island
This list is arranged by island in alphabetical order, with respective tributaries indented un ...
*
List of rivers of Sumatra
This is a list of rivers flowing in the island of Sumatra, Indonesia.''Map of Indonesia''. Peta Indonesia. Wawasan Nusantara. CV. Indo Prima Sarana. Accessed 29 Juli 2017.
In alphabetical order
Mouth location North coast
Northeast coast
...
References
{{Authority control
Rivers of Riau
Siak basin