Kelai RiverThe Kelai River is a river of Borneo, in the province of East Kalimantan, Indonesia, about north of the provincial capital Samarinda. It is a tributary of the Berau River.GeographyThe river flows in the eastern area of Kalimantan with a predominantly tropical rainforest climate. The annual average temperature in the area is. The warmest month is September, when the average temperature is around, and the coldest is January, at. The average annual rainfall is. The wettest month is December, with an average of rainfall, and the driest is August, with rainfall.