The park was first established on 28 June 1990 as the Tipulu-an Mau-it Rivers Watershed Forest Reserve covering 7,737 hectares (19,120 acres) of an important watershed.[3][4]
Geography
Sibalom Natural Park extends over sixteen barangays (village) in Sibalom.[5] It is located 36 kilometres (22 mi) east from Antique's provincial capital, San Jose de Buenavista, and some 140 kilometres (87 mi) west from Iloilo City. The park is organized around the watershed area of the Tipulu-an River and Mao-it River which are tributaries of the Sibalom River. It has seven other tributaries which provide drinking water for five municipalities and irrigate some 5,500 hectares (14,000 acres) of riceland in four municipalities of Antique.[2]Mount Porras at 800 feet (240 m) is the highest peak in the area and is located at the park's center.[5]
Forest
The park has a mild montane forest, a lowland forest, some bushland and open cogon or grassland.[2] Its riverbeds contain semi-precious gemstones such as agate, jasper and onyx.[5]
About 5,000 hectares of forest in Sibalom from Mount Porras extending to Mount Igmatindog, covers Sibalom River and its tributaries. Of this forest, 672 hectares are undisturbed by any human activity while about 4,223 hectares constitutes the 50-year-old reforestation site.[6]