Abra River

The Abra River also called Lagben River is the seventh largest river system in the Philippines in terms of watershed size. It has an estimated drainage area of and a length of from its source in the vicinity of Mount Data in Benguet province.
Geography.
The Abra originates in the southern section of Mount Data. It descends westward to Cervantes, Ilocos Sur, and flows into Abra. At a point near the municipality of Dolores, it is joined by the Tineg River, which originates in the uplands of Abra.