Note 8 — Relation of the Philipinas Islands
Reading edition
According to U.S. Philippine Gazetteer (pp. 9, 10, 286), there are now in the province of Ambos Camarines no active volcanoes, although its mountains form a volcanic chain. The peaks of Labo, Colasi, Isarog, and Iriga are extinct volcanoes, their height ranging from 4,000 to 6,450 feet.