Rokan-kanan River is a river in Riau province, in central part of Sumatra island, Indonesia, about 1,100 km northwest of the capital Jakarta.

The river flows in the central area of Sumatra, which is a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

The warmest month is August, when the average temperature is around 24 °C, and the coldest is January, at 22 °C.

[4] The average annual rainfall is 2742 mm.

The wettest month is November, with an average of 401 mm rainfall, and the driest is June, with 85 mm rainfall.