Barito River



The Barito River is the second longest river in Borneo after the Kapuas River with a total length of 1,090 km and a drainage basin of 81675 km2 in South Kalimantan, Indonesia. It originates in the Muller Mountain Range, from where it flows southward into the Java Sea. Its most important affluent is the Martapura River, and it passes through the city of Banjarmasin.

This river is the location of the closest relative of the Malagasy language of Madagascar, the Ma'anyan language of Dayaks, from where settlers arrived in Madagascar (presumably in waves) from the 3rd to 10th century and from which the current island nation's population largely traces its origins.

Geography
The river flows in the southeast area of Borneo with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). The annual average temperature in the area is 24 C. The warmest month is October, when the average temperature is around 26 C, and the coldest is January, at 20 C. The average annual rainfall is 2735 mm. The wettest month is December, with an average of 437 mm rainfall, and the driest is September, with a 62 mm rainfall.