Question: Jasus paulensis, also commonly known as the St Paul rock lobster, is a species of spiny lobster found in the waters around Saint Paul Island in the southern Indian Ocean and around Tristan da Cunha, colloquially Tristan, is the name of both a remote group of volcanic islands in which Ocean southern region, and the main island of that group?

Context paragraphs:
Geography of Tristan da Cunha: 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.

Jasus paulensis: Jasus paulensis, also commonly known as the St Paul rock lobster, is a species of spiny lobster found in the waters around Saint Paul Island in the southern Indian Ocean and around Tristan da Cunha in the southern Atlantic Ocean.  At one time the rock lobsters on Tristan da Cunha were believed to be a separate species known as the Tristan rock lobster ("Jasus tristani"), but the use of mitochondrial DNA sequencing has shown them to be identical.  Some authorities, for example the IUCN, retain them as separate species.  The Tristan rock lobster features on the coat of arms and the flag of Tristan da Cunha.

Jasus edwardsii: Jasus edwardsii, the southern rock lobster, red rock lobster, or spiny rock lobster, is a species of spiny lobster found throughout coastal waters of southern Australia and New Zealand including the Chatham Islands.  This species is commonly called crayfish or crays in New Zealand and "kōura " in Māori.  They resemble lobsters, but lack the large characteristic pincers on the first pair of walking legs.

Panulirus versicolor: Panulirus versicolor is a species of spiny lobster that lives in tropical reefs.  Other names include painted rock lobster, common rock lobster, bamboo lobster, blue lobster, and blue spiny lobster.  "P. versicolor" is one of the three most common varieties of spiny lobster in Sri Lanka, alongside "Panulirus homarus" and "Panulirus ornatus".

Ascension Island: 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.

Panulirus penicillatus: Panulirus penicillatus is a species of spiny lobster that lives on shallow rocky and coral reefs in the tropical Indo-Pacific region.  Common names for this spiny lobster include variegated crayfish, tufted spiny lobster, spiny lobster, Socorro spiny lobster, red lobster, pronghorn spiny lobster, golden rock lobster, double spined rock lobster and coral cray.  It has a very wide range and the International Union for Conservation of Nature has assessed its conservation status as being of "least concern".

Panulirus ornatus: Panulirus ornatus (known by a number of common names, including tropical rock lobster, ornate rock lobster, ornate spiny lobster and ornate tropical rock lobster) is a large edible spiny lobster with 11 larval stages that has not been successfully bred in captivity.

Administrator of Tristan da Cunha: 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.

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.

Jasus lalandii: Jasus lalandii (also called the Cape rock lobster or West Coast rock lobster) is a species of spiny lobster found off the coast of Southern Africa.  It is not known whom the specific epithet "lalandii" commemorates, although it may be the French astronomer Jérôme Lalande.

Supporting paragraphs: Jasus paulensis Tristan da Cunha
Answer: Atlantic