Mandau River is a river in Riau province of central Sumatra island, Indonesia, about 1,000 km northwest of the capital Jakarta. It is a tributary of the Siak River. The river flows in the central area of Sumatra which has a predominantly tropical rainforest climate. The annual average temperature in the area is 23 °C. The warmest month is August, whe…Mandau River is a river in Riau province of central Sumatra island, Indonesia, about 1,000 km northwest of the capital Jakarta. It is a tributary of the Siak River. The river flows in the central area of Sumatra which has a predominantly tropical rainforest climate. The annual average temperature in the area is 23 °C. The warmest month is August, when the average temperature is around 24 °C, and the coldest is January, at 22 °C. The average annual rainfall is 2899 mm. The wettest month is November, with an average of 403 mm rainfall, and the driest is June, with 115 mm of rain.
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