Which island is the largest in the Aleutian Islands?

Which island is the largest in the Canary Islands? What is the name of the largest island in the Kuril Islands? Which island is the largest in the Galapagos Islands? What is the name of the largest island in the Orkney Islands? What is the name of the largest island in the Ionian Islands? Which island is the largest in the Cyclades? What is the world's largest island by area? Which island nation is located in the North Atlantic and is known for its hot springs and geothermal activity?