The Rat Islands is a group of islands in the Aleutian Islands in southwest Alaska, between the Near Islands, to its west, and the Andreanof Islands group, to its east, at about 52° 6' North, 177° 36' West.
The largest islands in the group, from west to east, Kiska, Rat Island or Kryssei, Chugul, Amchitka and Buldyr.
The name Rat Islands is the English translation of the name given to the islands by Captain Feodor Petrovich Luke in 1827 when he visited the Aleutian Islands on a voyage around the world.