The Ombilin River is a river in West Sumatra, Indonesia, about 900 km northwest of the capital Jakarta.

It is called Batang Kuantan (Kuantan River) in the Kuantan Singingi Regency and downstream until the river mouth at the Strait of Malacca is called Batang Indragiri (Indragiri River).

[3] The river flows in the central area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen–Geiger climate classification).

The warmest month is May, when the average temperature is around 24 °C, and the coldest is January, at 20 °C.

The wettest month is November, with an average of 444 mm rainfall, and the driest is June, with 124 mm rainfall.