Catarman is a first class municipality and the capital of Northern Samar, Philippines. It is the largest town in terms of land area and population in the province. According to the 2010 census, it has a population of 84,833, making it the most populous municipality in Eastern Visayas. It is the commercial, educational, financial, political and government center of the province. It lies on the northern part of Samar Island, bounded to the east by Mondragon, to the west by Bobon, to the south by Lope de Vega, and to the north by the Philippine Sea.