バシー海峡
It borders the Ilocos Norte municipality of Pagudpud to the west; Calanasan, Apayao, to the south-west; Claveria, Cagayan, to the east. It also shares a third of the area of the Calvario National Park along with the municipality of Pagudpud. Taiwan directly to the north of Luzon Island via Luzon Strait to Bashi Channel.