Please answer the following question: Information: - A crater lake is a lake that forms in a volcanic crater or caldera, such as a maar; less commonly and with lower association to the term a lake may form in an impact crater caused by a meteorite, or in an artificial explosion caused by humans. Sometimes lakes which form inside calderas are called caldera lakes, but often this distinction is not made. Crater lakes covering active (fumarolic) volcanic vents are sometimes known as volcanic lakes, and the water within them is often acidic, saturated with volcanic gases, and cloudy with a strong greenish color. For example, the crater lake of Kawah Ijen in Indonesia has a pH of under 0.5. Lakes located in dormant or extinct volcanoes tend to have fresh water, and the water clarity in such lakes can be exceptional due to the lack of inflowing streams and sediment. - Vitiaz Strait is a strait between New Britain and the Huon Peninsula, northern New Guinea. - Umboi (also named Rooke or Siassi) is a volcanic island between the mainland of Papua New Guinea and the island of New Britain. It is separated from New Britain by Dampier Strait and Huon Peninsula, New Guinea Island by Vitiaz Strait. It has an elevation of . Umboi is a Holocene complex volcano with no historic eruptions. A complex volcano refers to the extensive assemblage of spatially, temporally, and genetically related major and minor volcanic centers with their associated lava and pyroclastic flows. - New Guinea (or, historically, "") is a large Island in the South West Pacific region. - Ritter Island is a small crescent - shaped volcanic island 100 kilometres northeast of New Guinea , situated between Umboi Island and Sakar Island . There are several recorded eruptions of this basaltic - andesitic stratovolcano prior to a spectacular lateral collapse which took place in 1888 . Before that event , it was a circular conical island about 780 metres high . At about 5:30 am local time on 31 March 1888 a large portion of the island , containing perhaps 5 km3 of material slid into the sea during a relatively minor , possibly VEI 2 , phreatic eruption . Eyewitnesses at Finschhafen , 100 km to the South , heard explosions and observed an almost imperceptible ash fall . Tsunamis 12 -- 15 metres high were generated by the collapse and devastated nearby islands and the adjacent New Guinea coast killing around 3000 people . The collapse left a 140 metre high 1900 metre long crescent - shaped island with a steep west - facing enscarpment . At least two small eruptions have occurred offshore since 1888 , one in 1972 and another in 1974 , which have resulted in the construction of a small submarine edifice within the collapse scar . - The Bismarck Sea lies in the southwestern Pacific Ocean to the north of the island of Papua New Guinea and to the south of the Bismarck Archipelago and Admiralty Islands. Like the Bismarck archipelago, it is named in honour of the German chancellor Otto von Bismarck. The Bismarck archipelago extends round to the east and north of the sea, enclosing the Bismarck Sea and separating it from the Pacific Ocean. To the south it is linked to the Solomon Sea by the Vitiaz Strait. - New Britain, is the largest island in the Bismarck Archipelago (named after Otto von Bismarck) of Papua New Guinea. It is separated from the island of New Guinea by the Dampier and Vitiaz Straits and from New Ireland by St. George's Channel. The main towns of New Britain are Rabaul/Kokopo and Kimbe. The island is roughly the size of Taiwan. While the island was part of German New Guinea, it was named Neupommern ("New Pomerania"). - Sakar Island is a volcanic island north-west of New Britain in the Bismarck Sea, at . It is a stratovolcano with a summit crater lake. No recorded eruptions are known. - An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. A grouping of geographically or geologically related islands is called an archipelago, e.g. the Philippines. - Huon Peninsula is a large rugged peninsula on the island of New Guinea in Morobe Province, eastern Papua New Guinea. It is named after French explorer Jean-Michel Huon de Kermadec. The peninsula is dominated by the steep Saruwaged and Finisterre and Cromwell Mountains. The nearest large town is the Morobe provincial capital Lae to the south, while settlements on the north coast include the former German town of Finschhafen, the district capital of Wasu, Malalamai and Saidor with its World War II era Saidor Airport. - Papua New Guinea (PNG Hiri Motu: "Papua Niu Gini"), officially the Independent State of Papua New Guinea, is an Oceanian country that occupies the eastern half of the island of New Guinea and its offshore islands in Melanesia, a region of the southwestern Pacific Ocean north of Australia. Its capital, located along its southeastern coast, is Port Moresby. The western half of New Guinea forms the Indonesian provinces of Papua and West Papua. Given the information above, choose from the list below the object entity that exhibits the relation 'country' with the subject 'ritter island'. Choices: - australia - guinea - indonesia - papua new guinea - philippines
A:
papua new guinea