Maestro de Campo Island (Sibale Island) or in some records Maestre de Campo Island is the westernmost island in the province of Romblon in the Philippines. It has one municipality named Concepcion. The island is also called Sibale and its inhabitants call themselves Sibalenhons. Many people believed that it has been an enchanted island. The island is mountainous with steep shores; it contains one small town named Concepcion on the east shore; and its area is approximately 2,020 hectares.