Abulog
In terms of watershed size, the Abulog River, also known as the Abulug River, is the Philippines' ninth longest river system. It has a drainage area of 3,372 square kilometers (1,302 square miles) and a length of 196 kilometers (122 miles) from its headwaters in the mountains of Apayao in the Cordillera Administrative Region. More than 90% of the river's drainage area is in Apayao province, with the remainder, including the river's mouth, in Cagayan province.
The upper reaches of the Abulug River, particularly upstream from Kabugao, are known colloquially as the Apayao River. The DENR's River Basin Control Office (RBCO) has recognized the Apayao-Abulug River Basin as one of 18 main river basins across the country as priority regions for sustainable resource management and development. Following the watershed to coastal area resource management framework, it was the topic of an integrated area development study.
The Apayao-Abulug River Basin spans the Cordillera provinces of Apayao and Cagayan in Region II.
Length: 196 km (122 mi)
