Which island nation is located in the North Atlantic and is known for its hot springs and geothermal activity?

Which island is the largest in the Aleutian 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? What is the world's second-largest island by area? Which island nation is located off the coast of East Africa and is known for its unique wildlife? Which island is the largest in the Japanese archipelago? What is the largest island in the British Isles?