Jalaur River, also known as Jalaud River, is the second longest river in Panay island and the second largest by drainage basin, only Panay River in Capiz has the longest and the largest river system in Panay. Jalaur river ranked 17th largest river system in the Philippines in terms of drainage basin size. It has an estimated drainage area of 1,503 square kilometers ( 580 square miles ) and travels 123 kilometers ( 76 miles ) from its source to its mouth in the Guimaras Strait. It drains the eastern portion of the island and traverses through Passi City and the towns of Leganes, Zarraga, Dumangas, Barotac Nuevo, Pototan, Dingle, San Enrique, Duenas, and Calinog.
The river is of great economic importance to the province of Iloilo. It provides irrigation to farmlands in the province as well as providing a source of potable water for its inhabitants.
The river has an annual average discharge of 40.29 m³/second.
The lower reached of Jalaur River experiences seasonal flooding. When there is heavy downpour, during the months of June–September, the river overflows and floods the surrounding area. Panay island is also located within the typhoon belt, which experiences several typhoons annually, is also a major factor of flooding of the river.
- Passi City
- Leganes, Iloilo
- Zarraga, Iloilo
- Dumangas, Iloilo
- Barotac Nuevo, Iloilo
- Pototan, Iloilo
- Dingle, Iloilo
- San Enrique, Iloilo
- Duenas, Iloilo
- Calinog, Iloilo
Jalaur River is used in irrigating 15,519 hectares in the province of Iloilo through the Jalaur River Irrigation System.
The Metro Iloilo Water District Services, the potable water provider for Iloilo City also source out some of their water requirement from the river.