Ometepe is an island formed by two volcanoes rising from Lake Nicaragua. Its name derives from the Nahuatl words one (two) and tepetl (mountain), meaning two mountains. It is the largest island in Lake Nicaragua as well as the largest volcanic island inside a fresh water lake in the world. The two volcanoes, Concepción and Maderas, are joined by a low isthmus to form one island in the shape of an hourglass. Ometepe has an area of 276 km². It is 31 km long and 5 to 10 km wide. The
island has a population of 42,000, and an economy based on livestock, agriculture, and tourism.