The Tonga Trench, an oceanic trench, is located in the South Pacific Ocean and is 10,882 metres (35,702 ft) deep at its deepest point, known as the Horizon Deep. According to the August 2011 version of the GEBCO Gazetteer of Undersea Feature Names, the depth of the Horizon Deep are given as 10,800 m (35,433 ft) ±10 m (33 ft).