Serayu River Kali Serayu, Sungai Serayu, Ci Sarayu, Kali Seraju, Kali Serajoe, Chi Seraju, Serdju, Serajoe River
Serayu river at Kebasen, Banyumas
Location of river mouth Show map of Java 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 Serayu River is a river in Central Java, Indonesia, about 300 km southeast of the capital Jakarta.^[3][4]

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]

• 
  Serayu river
• 
  Railroad construction by the Serayu near Kebasen, Banyumas
• 
  Railroad bridge across Serayu near Kebasen
• 
  Bridge at Rawalo, Banyumas
• 
  Bridge near Maos, Cilacap (before 1917)
• 
  Bridge built in 1890
• 
  Serayu river

• Sarayu River, in India, Sarayu and Serayu have been named after river in Hindu epic Ramayana
• Sunda Kingdom, Hindu kingdom of Central and Western Java through which this river flowed
• List of drainage basins of Indonesia
• List of rivers of Indonesia
• List of rivers of Java

7°41′17″S 109°06′02″E / 7.68806°S 109.10056°E / -7.68806; 109.10056