Mountain Province is located up through the center of Luzon, with its sub-province Apayao reaching the top of the island.

This region produced a few notes that were very similair to each other (12 notes total), and a beginning collector should have little trouble assembling a complete set of the notes.  The more advanced collector could still spend much time in this region, as many of the notes were counterstamped by the individual municipalities (cities) within the region, and you could collect by counterstamp, as well. Some of these counterstamps are very difficult to obtain, while others are relatively common.