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 5125 km2 and a length of 179 km from its source near Mount Data in Benguet province.

History
In 1823, an Augustinian priest, Fr. Bernardo Lago arrived on the town of Pidigan, where he built a church and a rectory atop a hill near the river, marking the official start of Catholicism in Abra.

In 2022, the Abra River Fault, which runs along the river, triggered a magnitude 7.0 earthquake in Abra.

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. There are also other small rivers like the Binongan River, Ikmin River, and other rivers connecting to Abra River.

Crossings
This is listed from mouth to source.


 * 1) Quirino Bridge (, Santa–Bantay boundary, Ilocos Sur)
 * 2) Old Quirino (Banaoang) Bridge (Santa–Bantay boundary, Ilocos Sur)
 * 3) Calaba Bridge (Ilocos Norte–Abra Road, Bangued)
 * 4) Don Mariano Marcos Bridge (Abra–Kalinga Road, Tayum–Dolores boundary)
 * 5) Sto. Tomas Bridge (Manabo, Abra)
 * 6) Aluling Bridge (Tagudin–Cervantes–Sabangan Road (Cervantes)
 * 7) Cervantes–Mankayan–Abatan Road (Cervantes, Ilocos Sur)
 * 8) Magmaguey Bridge (La Paz, Abra)