Teunom River  Teunom River is a river in northern Sumatra, in the province of Aceh, Indonesia, about 1700 km northeast of the capital Jakarta. The river flows along the northern area of Sumatra with predominantly tropical rainforest climate (designated as "Af" in the Köppen-Geiger climate classification). The annual average temperature in the area is 23 °C. The warmest month is February, when the average temperature is around 26 °C, and the coldest is January, at 22 °C. The average annual rainfall is 4059 mm. The wettest month is November, with an average of 536 mm rainfall, and the driest is July, with 205 mm rainfall.