Alejo R. Mabanag (born July 14, 1886 – ?) was a Filipino politician born in San Fernando, La Union, to Liberato Mabanag of Calamanugan, Cagayan and Manuela Ragojo of Bangar, La Union.
The name Bangar (pronounced: Bang-gar) is derived from the bangar tree (pronounced ba- ngar; Sterculia foetida), which were once abundant in the general area of the present town.
A road border crossing into Sarawak, Malaysia is located in this mukim, along the road between Bangar and Lawas.
Perdayan Forest Recreation Park is situated on the road to Labu, approximately 15 km from Bangar town.