| Serayu River | |
| Name Other: | Kali Serayu, Sungai Serayu, Ci Sarayu, Kali Seraju, Kali Serajoe, Chi Seraju, Serdju, Serajoe River |
| Pushpin Map: | Indonesia Java#Indonesia |
| Pushpin Map Size: | 285 |
| Pushpin Map Caption: | Location of river mouth |
| Source1 Location: | Mt. Prahu[1] (Dieng Volcanic Complex) |
| Subdivision Type1: | Country |
| Length: | [2] |
| Source1 Elevation: | [3] |
| Source1 Coordinates: | -7.3117°N 109.9924°W |
| Mouth Coordinates: | -7.6835°N 109.1069°W |
| River System: | Serayu River |
| Tributaries Left: | Begaluh, Sapi |
| Tributaries Right: | Tulis, Merawu, Klawing, Tajum |
| Discharge1 Location: | Near mouth |
| Discharge1 Min: | (Period: 2005–2014)[4] |
| Discharge1 Avg: | (Period: 2005–2014)[5] |
| Discharge1 Max: | (Period: 2005–2014)[6] |
| Discharge2 Location: | Rawalo (Basin size: [7] |
| Discharge2 Min: | (Period: 1971–1995)[8] |
| Discharge2 Avg: | (Period: 1971–1995)[9] |
| Discharge2 Max: | (Period: 1971–1995)[10] |
| Discharge3 Location: | Banjarnegara (Basin size: [11] |
| Discharge3 Min: | (Period: 1978–1995)[12] |
| Discharge3 Avg: | (Period: 1978–1995)[13] |
| Discharge3 Max: | (Period: 1978–1995)[14] |
| Basin Size: | [15] to [16] |
The Serayu River is a river in Central Java, Indonesia, about 300 km southeast of the capital Jakarta.[17] [18]
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.[19]
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).[20] 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.[21] 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.[22]
Mrica Dam is a hydroelectric power dam installed in the Serayu River.[23] [24]
Water rafting is one of the tourist attractions in the villages of Tunggara and Prigi, in Banjarnegara Regency.[25]