The Serayu River is a river in Central Java, Indonesia, about 300 km southeast of the capital Jakarta.[3][4]
| Serayu River
Kali Serayu, Sungai Serayu, Ci Sarayu, Kali Seraju, Kali Serajoe, Chi Seraju, Serdju, Serajoe River
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|---|---|
Serayu river at Kebasen, Banyumas
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  Location of river mouth  Serayu River (Indonesia) Show map of Indonesia | |
| Location | |
| Country | Central Java, Indonesia |
| Physical characteristics | |
| Source | |
| • location | Mt. Prahu[1] (Dieng Volcanic Complex) |
| • coordinates | 7°18′41.9436″S 109°59′32.8056″E / 7.311651000°S 109.992446000°E / -7.311651000; 109.992446000 |
| • elevation | 2,565 m (8,415 ft)[1] |
| Mouth | |
• location | Indian Ocean |
• coordinates | 7°41′0.5604″S 109°6′24.9876″E / 7.683489000°S 109.106941000°E / -7.683489000; 109.106941000 |
• elevation | 0 m (0 ft) |
| Length | 181 km (112 mi)[1] |
| Basin size | 3,738 km2 (1,443 sq mi)[2] to 4,375 km2 (1,689 sq mi)[1] |
| Discharge | |
| • location | Near mouth |
| • average | (Period: 2005–2014)441.19 m3/s (15,580 cu ft/s)[2] 415 m3/s (14,700 cu ft/s) |
| • minimum | (Period: 2005–2014)131.4 m3/s (4,640 cu ft/s)[2] |
| • maximum | (Period: 2005–2014)1,370.5 m3/s (48,400 cu ft/s)[2] |
| Discharge | |
| • location | Rawalo (Basin size: 2,631 km2 (1,016 sq mi)[1] |
| • average | (Period: 1971–1995)273.41 m3/s (9,655 cu ft/s)[1] |
| • minimum | (Period: 1971–1995)58.8 m3/s (2,080 cu ft/s)[1] |
| • maximum | (Period: 1971–1995)1,497 m3/s (52,900 cu ft/s)[1] |
| Discharge | |
| • location | Banjarnegara (Basin size: 704 km2 (272 sq mi)[1] |
| • average | (Period: 1978–1995)57.16 m3/s (2,019 cu ft/s)[1] |
| • minimum | (Period: 1978–1995)17.3 m3/s (610 cu ft/s)[1] |
| • maximum | (Period: 1978–1995)548 m3/s (19,400 cu ft/s)[1] |
| Basin features | |
| River system | Serayu River |
| Tributaries | |
| • left | Begaluh, Sapi |
| • right | Tulis, Merawu, Klawing, Tajum |
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.[5]
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).[6] 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.[7] 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.[8]
Mrica Dam is a hydroelectric power dam installed in the Serayu River.[9][10]
Water rafting is one of the tourist attractions in the villages of Tunggara and Prigi, in Banjarnegara Regency.[11]
7°41′17″S 109°06′02″E / 7.68806°S 109.10056°E / -7.68806; 109.10056