It is a 4th class municipality in the province of Sorsogon, Philippines.
It lies at the southernmost tip of the island of Luzon. Local elders say that the name Matnog comes from the word "matonog" (very audible) - that describes to the loud sound of the waves. The site of one of the busiest seaports in the Philippines, it is the jump off point to the Southern Philippines and vice-versa.
According to the 2000 census, it has a population of 32,712 people in 6,069 households.
A Memorandum of Agreement (MOA) had been signed for the Project in July 2009 between Japanese consortium group lead by Chikyusalsei Kikou Ltd (Earth Rebirth Engineering Ltd.) President Dr. Hisato Nakamatsu, AIPAC Philippines, Liga ng Magniniyog, and Local Government Unit of Matnog led Matnog Mayor Guillermo So.