 Together with the Abulog River in Cagayan province, the river forms the Apayao-Abulug River Basin, the 9th largest river system in the country.The river is picturesque through much of its length, and features a number of waterfalls and other features as it runs through the center of the province.The Isneg, or Apayao, people live along the banks of the Apayao River and its tributaries.