| Sinamar River | |
| Name Other: | Batang Sinamar, Sungai Sinamar |
| Pushpin Map: | Indonesia Sumatra#Indonesia |
| Pushpin Map Size: | 285 |
| Pushpin Map Caption: | Location of river mouth |
| Subdivision Type1: | Country |
The Sinamar River is a river in West Sumatra province, in the central part of Sumatra island, Indonesia, about 900 km northwest of the capital Jakarta.[1] [2] It is a tributary of the Ombilin/Indragiri River.
The river flows in the central area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen–Geiger climate classification).[3] The annual average temperature in the area is 23 °C. The warmest month is September, when the average temperature is around 24 °C, and the coldest is January, at 21 °C.[4] The average annual rainfall is 3023 mm. The wettest month is November, with an average of 444 mm rainfall, and the driest is June, with 124 mm rainfall.[5]