Question: What is the largest island south of the most northerly of the abstract five major circles of latitude shown on maps of the Earth?

Context paragraphs:
Arctic Circle (disambiguation): Arctic Circle is one of the five major circles of latitude that mark maps of the Earth.

Ellesmere Island: Ellesmere Island (Inuit: Umingmak Nuna, meaning "land of muskoxen") is part of the Qikiqtaaluk Region in the Canadian territory of Nunavut.  Lying within the Canadian Arctic Archipelago, it is considered part of the Queen Elizabeth Islands, with Cape Columbia being the most northerly point of land in Canada.  It comprises an area of 196235 km2 and the total length of the island is 830 km , making it the world's tenth largest island and Canada's third largest island.  The Arctic Cordillera mountain system covers much of Ellesmere Island, making it the most mountainous in the Canadian Arctic Archipelago.  The Arctic willow is the only woody species to grow on Ellesmere Island.

Hitra: Hitra is a municipality and an island in Sør-Trøndelag county, Norway.  The municipality covers the island of Hitra and several smaller islands, and is part of the Fosen region.  With a land area of 571.5 km2 , the island of Hitra is the seventh largest island in mainland Norway, and the largest island south of the Arctic Circle.

North Star Island: North Star Island is an island at the northern tip of Labrador in the province of Newfoundland and Labrador, Canada.  This island, measuring only 186m by 57 meters, is the most northerly island in the province.  It lies approximately 1.5 kilometers of the coast of Killiniq Island south of Cape Chidley.

Latitude: In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.  Latitude is an angle (defined below) which ranges from 0° at the Equator to 90° (North or South) at the poles.  Lines of constant latitude, or "parallels", run east–west as circles parallel to the equator.  Latitude is used together with longitude to specify the precise location of features on the surface of the Earth.  Without qualification the term latitude should be taken to be the "geodetic latitude" as defined in the following sections.  Also defined are six "auxiliary latitudes" which are used in special applications.

Antarctic Circle: The Antarctic Circle is the most southerly of the five major circles of latitude that mark maps of the Earth.  The region south of this circle is known as the Antarctic, and the zone immediately to the north is called the Southern Temperate Zone.  South of the Antarctic Circle, the sun is above the horizon for 24 continuous hours at least once per year (and therefore visible at midnight) and (at least partially) below the horizon for 24 continuous hours at least once per year (and therefore not fully visible at noon); this is also true within the equivalent polar circle in the Northern Hemisphere, the Arctic Circle.

Bulla Island: Bulla Island, also Xara Zira, Khara Zira or Khere Zire, (Azerbaijani: "Xǝrǝ Zirǝ Adası" ) is an island south of the Bay of Baku, Caspian Sea.  It is the largest island of the Baku Archipelago, located off Baku, Azerbaijan.

Arctic Circle: The Arctic Circle is the most northerly of the abstract five major circles of latitude as shown on maps of the Earth.  It marks the northernmost point at which the noon sun is just visible on the northern winter solstice and the southernmost point at which the midnight sun is just visible on the northern summer solstice.  The region north of this circle is known as the Arctic, and the zone just to the south is called the Northern Temperate Zone.  North of the Arctic Circle, the sun is above the horizon for twenty-four continuous hours at least once per year (and therefore visible at midnight) and below the horizon for twenty-four continuous hours at least once per year (and therefore not visible at noon); this is also true within the equivalent polar circle in the Southern Hemisphere, the Antarctic Circle.

Nunivak Island: Nunivak Island ("Nunivaaq" in Central Alaskan Yup'ik, "Nuniwar" in Nunivak Cup'ig), the second largest island in the Bering Sea, is a permafrost-covered volcanic island lying about 30 miles (48 km) offshore from the delta of the Yukon and Kuskokwim rivers in the state of Alaska, at about 60° North latitude.  Nunivak Island is 1,631.97 sq mi (4,226.78 km², or 1.044 million acres) in area, 76.2 km long and 106 km wide, making it the eighth largest island in the United States.  It has a population of 210 persons as of the 2000 census.  The island's entire population lived in the north coast city of Mekoryuk.

Geographical zone: The five main latitude regions of the Earth's surface comprise geographical zones, divided by the major circles of latitude.  The differences between them relate to climate.  They are as follows:

Supporting paragraphs: Hitra Arctic Circle
Answer: Hitra