Niuafoʻou is a volcano located on an underwater ridge west of the line of all the other volcanoes of Tonga. The island contains a steep-sided caldera; the rim is over high, rising to a height of at Mokotu. The coastline is rocky and steep with only a few stony black sand beaches. The only landing place on the island is the end of a lava flow at Futu, in the west. All the villages are in the north and east. Public places—like the post office, telecommunications station and airport (Niuatoputapu Airport)—are in Angahā in the north, while a high school is located in Muʻa.