Question: The Nightingale Islands are a group of three islands, part of the Tristan da Cunha territory, Saint Helena, Ascension and Tristan da Cunha is a British Overseas Territory located in which location?
Context: Tristan da Cunha is an archipelago of five islands in the southern Atlantic Ocean, the largest of which is the island of Tristan da Cunha itself and the second-largest the remote bird haven Gough Island.  It forms part of a wider territory called Saint Helena, Ascension and Tristan da Cunha which includes Saint Helena and Ascension Island. Tristan da Cunha is part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha and has a history going back to the beginning of the 16th century.  It was settled by men from military garrisons and ships, who married native women from Saint Helena and the Cape Colony.  Its people are multi-racial, descended from European male founders and mixed-race (African, Asian and European) and African women founders. Stoltenhoff Island is a small uninhabited island in the South Atlantic Ocean, part of the Nightingale Islands.  It is the smallest of the Nightingale Islands, and is to the north west of Nightingale Island itself.  They are governed as part of Tristan da Cunha, an archipelago and part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha.  The island is part of the Nightingale Islands group Important Bird Area (IBA), identified as such by BirdLife International as a breeding site for seabirds and endemic landbirds. The Nightingale Islands are a group of three islands in the South Atlantic Ocean, part of the Tristan da Cunha territory.  They consist of Nightingale Island, Middle Island and Stoltenhoff Island.  The islands are administered by the United Kingdom as part of the overseas territory of Saint Helena, Ascension and Tristan da Cunha.  The Nightingale Islands are uninhabited. Ascension Island is an isolated volcanic island in the equatorial waters of the South Atlantic Ocean, around 1600 km from the coast of Africa and 2250 km from the coast of Brazil, which is roughly midway between the horn of South America and Africa.  It lies 7°56' South of the Equator.  It is governed as part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, of which the main island, Saint Helena, is around 1300 km to the southeast.  The territory also includes the sparsely populated Tristan da Cunha archipelago, some 3730 km to the south, about halfway to the Antarctic Circle. The Administrator of Tristan da Cunha is the head of government and representative of the Governor of Saint Helena in Tristan da Cunha.  The role of the Administrator is to chair the territory's Island council which consists of 8 elected members and 3 appointed members.  As a part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha, the head of state is Elizabeth II, with the Governor of Saint Helena appointed by the British government to act as her local representative.  However, as Tristan da Cunha is over 1,350 miles away from Saint Helena, an Administrator is appointed as the Governor's representative on the Island.  Previously the Administrator also acted as the local Magistrate, but the appointment is to be transferred to a non-member of the executive or legislative branches of government. Middle Island is a small, uninhabited island in the South Atlantic Ocean, part of the Nightingale Islands.  They are governed as part of Tristan da Cunha, an archipelago that is part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha.  The island is part of the Nightingale Islands group Important Bird Area (IBA), identified as such by BirdLife International as a breeding site for seabirds and endemic landbirds.  It is also known as Alex Island. Saint Helena, Ascension and Tristan da Cunha is a British Overseas Territory located in the South Atlantic and consisting of the island of Saint Helena, Ascension Island and the archipelago of Tristan da Cunha. The Saint Helena Police Service is the local police force for the British overseas territory of Saint Helena, Ascension and Tristan da Cunha, consisting of the islands of Saint Helena, Ascension and the island group of Tristan da Cunha. Tristan da Cunha ( ), colloquially Tristan, is the name of both a remote group of volcanic islands in the south Atlantic Ocean and the main island of that group.  It is the most remote inhabited archipelago in the world, lying 2000 km from the nearest inhabited land, Saint Helena, and 2400 km from the nearest continental land, South Africa.  It is 3360 km from South America.  The territory consists of the main island, named Tristan da Cunha, which has a north–south length of 11.27 km and an area of 98 km2 , along with the smaller, uninhabited Nightingale Islands and the wildlife reserves of Inaccessible and Gough islands.  As of January 2017, the main island has 262 permanent inhabitants.  The other islands are uninhabited, except for the personnel of a weather station on Gough Island.
Answer: South Atlantic Ocean