The climate is warm and very humid, with the average annual rainfall ranging from year to year between 2,863 and 5,517 mm, and the number of rainy days between 120 and 309; The temperature is rather stable with a typical minimum of 24 °C (75 °F) and maximum of 32 °C (90 °F) through the whole year.
The Kapuas River is a river in the Indonesian part of Borneo island. At 1,143km (710 miles) in length, it is the longest river of Indonesia and is the major waterway connecting the centre of the island with its western coast It originates in the Muller mountain range at the centre of the island and flows west into the South China Sea creating an extended marshy delta. The delta is located west-southwest of Pontianak, the capital of West Kalimantan province. The Borneo rainforest is 140 million years old, making it one of the oldest rainforests in the world. There are about 15,000 species of flowering plants with 3,000 species of 221 species of terrestrial mammals and 420 species of resident birds in Borneo. There are about 440 freshwater fish species in Borneo  
Upper Reaches

The river originates near the centre of Borneo, south from the Indonesian-Malaysian border. The river flows through dense tropical forests and the rich flora and fauna are the subject of international research.

Kapuas Lakes

About 350km from the source lies a system of Kapuas Lakes which are connected to the river by numerous channels. There are two national parks on the river banks, Betung Kerihun with an area of 8,000 km2 and Danau Sentarum (area 1,320 km2) including the Kapuas Lakes. Otters and crocodiles are common while Agile gibbons, Muller's Bornean gibbons, Prevost's squirrels and treeshrews inhabit the trees above the river.


The river discharges into the South China Sea creating a marshy delta, which spreads both inland and into the sea. The delta is located west-southwest of Pontianak, the capital of West Kalimantan province, which lies at the equator.[10] The delta has five arms, of which the northernmost one is the widest, and is therefore called the Big Kapuas (Indonesian: Kapuas Besar). The largest tributary is the Melawi River, which occurs to the left near the city of Sintang, about 465 km from the mouth. Other major tributaries are the Landak, Kubu, Punggur and Sekayam rivers.[10]

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