| Rokan River | |
| Name Other: | Sungai Rokan, Soengai Rekan |
| Pushpin Map: | Indonesia Sumatra#Indonesia |
| Pushpin Map Size: | 285 |
| Pushpin Map Caption: | Location of river mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Indonesia |
| Subdivision Type2: | Province |
| Subdivision Name2: | Riau |
| Discharge1 Avg: | (Period of data: 2009–2013)1506m3/s[1] |
| Basin Size: | 19258km2 |
| Tributaries Left: | Rokan-kanan River |
| Tributaries Right: | Rokan-kiri River |
| Discharge1 Location: | Rokan Delta, Bagansiapiapi, Malacca Strait |
Rokan River is a river in Riau province, central-eastern Sumatra, Indonesia, about 1,100 km northwest of the capital Jakarta.[2] [3]
The river originates in the Barisan Mountains in the west, and drains northeast-ward along Rokan Hulu Regency and Rokan Hilir Regency with estuarine located near the port town of Bagansiapiapi draining the water to Malacca Strait.
Tributaries include the Rokan-kiri River, Rokan-kanan River, Kumu River.
The river flows in the central area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[4] The annual average temperature in the area is 23 °C. The warmest month is March, when the average temperature is around 24 °C, and the coldest is January, at 22 °C.[5] The average annual rainfall is 3766 mm. The wettest month is November, with an average of 336 mm rainfall, and the driest is July, with 113 mm rainfall.[6]