With a total length of 73 kilometres (45 mi) and a drainage basin covering 682 square kilometres (263 sq mi), it is the largest river system in Antique and fourth longest in Panay after the Panay River, Jalaur River, and Aklan River.

Along with its main tributaries the Mao-it River and Tipulu-an River, it forms the 5,511.47-hectare (13,619.1-acre) Tipulu-an and Mao-it River Watershed Forest Reserve (now known as Sibalom Natural Park) which was proclaimed a natural park on April 23, 2000.

The river's watershed is considered one of the last remaining lowland rainforests on Panay.

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