The Sanen River is a river in southern East Java province, Java island, Indonesia, about 800 km east of the capital Jakarta.

The Sanen River is a tributary of the Mayang River that flows into a cape in Watuulo, the southern coastal area of Java.

The river originates in the southern mountainous region, near Mount Betiri.

[1][2] The river flows in the southeast area of Java with predominantly tropical monsoon climate (designated as Am in the Köppen–Geiger climate classification).

The warmest month is October, when the average temperature is around 23 °C, and the coldest is February, at 21 °C.