| Abra River | |
| Name Other: | Lagben River |
| Pushpin Map: | Luzon mainland#Philippines |
| Pushpin Map Caption: | Abra River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | Philippines |
| Subdivision Type2: | Region |
| Subdivision Type3: | Province |
| Length: | 206km (128miles) |
| Discharge1 Avg: | 350m3/s |
| Source1: | Mount Data |
| Source1 Location: | Benguet, Cordillera Administrative Region |
| Source1 Elevation: | 2310m (7,580feet) |
| Mouth: | South China Sea |
| Mouth Location: | Caoayan, Ilocos Sur |
| Mouth Coordinates: | 17.5131°N 120.3958°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 5125km2[1] |
| Tributaries Right: | Tineg 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 near Mount Data in Benguet province.[2]
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.[3]
In 2022, the Abra River Fault, which runs along the river, triggered a magnitude 7.0 earthquake in Abra.[4]
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.[5]
This is listed from mouth to source.