Kangaroo Island
Oahu is ranked third in area.
Maui is #2 in area and Oahu is #3.
Lana'i.
The largest island in Maine is Mount Desert Island. This island has an area of 108 square miles. It is the third largest island in the eastern United States.
Australia is the largest island, and country on Earth.
The largest island is Greenland with an area of 2,166,086 km2.
Merritt Island
Assuming that you take Australia to be an island, Greenland is the 2nd largest.
Borneo
Rakiura / Stewart Island.
Borneo is the third largest island in the world, after Greenland and New Guinea. It is located in Southeast Asia and is shared by three countries: Malaysia, Indonesia, and Brunei.
Including Tasmania, the island state of Australia, as the largest island, the third largest island of Australia would be Kangaroo Island.
Rakiura or Stewart Island.
The largest island in Italy is known as Sicily, this island has about 25711 sq. km. land area. The third largest island in Italy is called Isola Bella, this island is just as beautiful as its name.
Borneo is the third largest island in the world after Greenland and New Guinea. It is located in Southeast Asia, shared by the countries of Brunei, Indonesia, and Malaysia.
Jamaica is the third lagest island in the Caribbean sea Jamaica means land of wood and water
Negros island in the Visayas is the third largest island in the Philippines, after Luzon and Mindanao.
The third largest island in Europe is Ireland. It is located to the west of Great Britain and is divided between the Republic of Ireland and Northern Ireland, which is part of the United Kingdom.
Stewart Island (Rakiura).
GREENLAND Australia is an island continent. Greenland is one-third its size.