Porong River

The Porong River is a river flowing through Sidoarjo, East Java, Indonesia, about 700 km east of the capital Jakarta. It is one of the main distributaries of the Brantas River that discharges into the Bali Sea, close to the Madura Strait, and is the main outlet for the Lusi mudflow.

Geography
The river flows in the eastern area of Java with a predominantly tropical monsoon climate (designated as Am in the Köppen–Geiger climate classification). The annual average temperature in the area is 26 °C. The warmest month is October when the average temperature is around 28 °C, and the coldest is February, at 22 °C. The average annual rainfall is 2473 mm. The wettest month is January, with an average of 426 mm of rainfall, and the driest is August, with 20 mm of rainfall.