Abulog

The Abulog or Abulug is the 9th largest river system in the Philippines in terms of watershed size. It has an estimated drainage area of 3,372 square kilometres (1,302 sq mi) and a length of 175 kilometres (109 mi) from its source in the mountains of Apayao in the Cordillera Administrative Region. More than 90% of the drainage area of the river is located in Apayao province while the remaining, including the mouth of the river, is in Cagayan province.

Map of Abulog River, Philippines

The upper reaches of the Abulug River, especially upstream from Kabugao, is commonly known as the Apayao River.