Serayu River

The Serayu River is a river in Central Java, Indonesia, about 300 km southeast of the capital Jakarta.

Hydrology
The river spanned from northeast to southwest with a length of around 181 km, and crossing five kabupaten (regency) in Central Java; they are Wonosobo Regency, Banjarnegara Regency, Purbalingga Regency, Banyumas Regency, draining to Indian Ocean with estuarine located at Cilacap Regency.

Geography
The river flows in the southern central 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 24 °C. The warmest month is March, when the average temperature is around 25 °C, and the coldest is August, at 23 °C. The average annual rainfall is 3897 mm. The wettest month is January, with an average of 561 mm of rainfall, and the driest is September, with 34 mm of rainfall.

Uses
Mrica Dam is a hydroelectric power dam installed in the Serayu River.

Water rafting is one of the tourist attractions in the villages of Tunggara and Prigi, in Banjarnegara Regency.