What is the largest island in the Caribbean Sea?

Which ocean is home to the island of Madagascar? What is the largest island in the Mediterranean Sea? What is the largest island in the Canadian Arctic Archipelago? Which island is divided between the countries of Indonesia and Malaysia? What is the largest island in the Sea of Okhotsk? What is the largest island in the Bering Sea? Which island is divided between the countries of Argentina and Chile? Which island is home to the city of Reykjavik?