Ometepe is an island formed by two volcanoes rising out of Lake Nicaragua, located in the Rivas Department of the Republic of Nicaragua. Its name derives from the Nahuatl words ome (two) and tepetl (mountain), meaning "two mountains". It is the largest island in Lake Nicaragua.

Lake Nicaragua or Cocibolca or Granada is a freshwater lake in Nicaragua. Of tectonic origin and with an area of 8,264 km2 (3,191 sq mi), it is the largest lake in Central America, the 19th largest lake in the world and the tenth largest in the Americas, slightly smaller than Lake Titicaca. With an elevation of 32.7 metres (107 ft) above sea level, the lake reaches a depth of 26 metres (85 ft). It is intermittently joined by the Tipitapa River to Lake Managua.