Mesuji River is a river in Lampung province, Sumatra island, Indonesia, about 250 km northwest of the capital Jakarta.

[1] The river flows in the southeast area of Sumatra, which has a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).

[2] The annual average temperature in the area is 26 °C.

The warmest month is August, when the average temperature is around 28 °C, and the coldest is May, at 25 °C.

The wettest month being December, with an average of 547 mm rainfall, and the driest is September, with 40 mm of rain.