What is the name of the largest island in the Orkney Islands?

Which island is the largest in the Azores? 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? 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?