Inabanga River

Inabanga River
Inabanga River.jpg
Inabanga River is located in Philippines
Inabanga River
Country Philippines
Region Central Visayas
Province Bohol
Physical characteristics
Main source Sierra Bullones, Pilar
River mouth Cebu Strait
10°04′28″N 124°04′34″E / 10°04′28″N 124°04′34″E / 10.0744; 124.0761
Length 25 km (16 mi)
  • Maximum width:
    10 m (33 ft)
  • Average rate:
    22.86 m3/s (807 cu ft/s) [1]
Basin features
Progression Wahig–Inabanga
Basin size 627.93 km2 (242.45 sq mi) [1]
  • Right:
    Danao, Dagohoy
Waterbodies Reservoir of Pilar Dam

The Inabanga River is the largest river in Bohol, Philippines. It is 25 kilometres (16 mi) long and up to 7 to 10 metres (23 to 33 ft) deep at its mouth at the town of Inabanga. [2] [3]

Its name means "Rented River", from the root word abang which means "rent". Due to drownings and attacks by crocodiles (which used to inhabit the river), this loss of life was considered a rent for the use of the river. [3]

In May 2017, the Inabanga River was used by heavily armed members of Abu Sayyaf for a planned incursion into Bohol. [4]


Pilar Dam and reservoir

Its sources, the Wahig and Pamacsalan Rivers, spring in the mountains of Sierra Bullones and flow into an irrigation reservoir behind the Pilar or Malinao Dam. From there the Inabanga River bissects Bohol before draining in the Cebu Strait in the north-western part of the island. The major tributaries are the Dagohoy, Danao, Wahig, and Pamacsalan Rivers. Other minor tributaries are the Mas-ing, Sagnap, and Malitbog Rivers. [1] In 1905, the river was navigable up to 4.8 kilometres (3 mi) for boats drawing 6 ft, and up to 40 kilometres (25 mi) for rafts. [5]

The coastal plain is one to two miles wide where the river banks are muddy and fringed in many places by nipa mangroves, which are used by locals for nipa plantation and harvesting. Further upstream the surrounding hills rise steeply. [1] [6]

The river's estuary is a productive habitat for invertebrates, fish, and birds, as well as spawning and nursery grounds for many species of fish, supports seagrass vegetation, shellfish beds, and nesting grounds for a variety of birds. The estuary is under threat from human development pressures such as fish pens, oyster farms, recreational use, and pollution. [1]

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