[3] The town used to be called Dongon, a coastal village located currently at Barangay San Nicolas.[5] In 1832, the missionary friar Simeon Mendoza de la V. de Ibernalo[6] requested the Spanish government for the exemption of the town's inhabitants from paying taxes so that they could build a stone church, convent and fort at a hilly part of the village.Sablayan has a total land area of 2,188.80 square kilometers, making it the largest municipality in the Philippines.The Apo Reef, North and South Pandan Islands, and a portion of Mounts Iglit–Baco National Park are part of its jurisdiction.[7] Poverty incidence of Sablayan Source: Philippine Statistics Authority[13][14][15][16][17][18][19][20] On April 15, 2024, second placer, Sablayan's Mayor Walter B. Marquez received the P20 million award from the Department of Tourism's Tourism Champions Challenge, for the development of "Pinagpalang Lagusan sa Bakawanan" (Mangrove Forest park).