Is it ensure, insure, or assure?
island and town, southwestern Philippines. The island, between the Sulu (west) and Celebes (east) seas, is characterized by lush tropical vegetation, many short streams, and several extinct volcanoes, including Mount Tumatangas at 2,664 feet (812 metres). Mount Dajo National Park is a game refuge with an area of 526 acres (213 hectares). Jolo has considerable arable land that supports agriculture (rice, coconuts, cassava, fruits), but the principal economic activity is fishing. The main population centres are Jolo town, Parang, Patikul, and Talipaw.