Bian River (Indonesia)

Bian River Wai Bian, Bian-rivier, Sungai Bian
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Location
Country	Indonesia
Province	South Papua
Regency	Merauke
Physical characteristics
Source	Butiptiri
• location	Southeast of Asike
Mouth	Arafura Sea
• location	District of Okaba, Merauke
Length	580.6 km (360.8 mi)
Basin size	8,044.3 km2 (3,105.9 sq mi)
Width
• minimum	70 m (230 ft)
• maximum	1,447.1 m (4,748 ft)
Discharge
• location	Near mouth
• average	392 m3/s (13,800 cu ft/s)

The Bian River or Mbian River is a river in Merauke Regency, South Papua, Indonesia.^[1] Its total length is 580.6 km and its width is around 70 – 1447.1 m.^[2] Some 900 people in its upper course are said to speak the language Bian Marind.^[3]

The river flows in the southern area of Papua with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).^[4] The annual average temperature in the area is 23 °C. The warmest month is October when the average temperature is around 25 °C, and the coldest is June, at 20 °C.^[5] The average annual rainfall is 2952 mm. The wettest month is May, with an average of 405 mm rainfall, and the driest is August, with 62 mm rainfall.^[6]

In the district of Muting (Merauke Regency), the Bian River is a nature reserve by the order of the Ministry of Forestry^[7] as the habitat of various protected flora and fauna, among others: Archerfish and Asian arowana.^[8]

• List of drainage basins of Indonesia
• List of rivers of Indonesia
• List of rivers of Western New Guinea

8°07′09″S 139°56′28″E / 8.1193°S 139.9411°E / -8.1193; 139.9411