By Size:
* Continent-sized: Greenland, Australia, Madagascar
* Large: Great Britain, Honshu (Japan), Borneo
* Medium: Crete, Sicily, Iceland
* Small: Manhattan (New York City), Santorini (Greece), Bermuda
By Formation:
* Continental: New Guinea, Madagascar, Greenland (formed from continental drift)
* Volcanic: Hawaii, Iceland, Santorini (formed by volcanic eruptions)
* Coral: Maldives, Fiji, Great Barrier Reef (formed from coral reefs)
* Deltaic: Sunda Islands (Indonesia), the Nile Delta (Egypt) (formed from river sediment)
By Location:
* Oceanic: Hawaii, Madagascar, Iceland (surrounded by ocean)
* Lake: Isle Royale (Lake Superior), Mackinac Island (Lake Huron), St. Clair Island (Lake St. Clair)
* River: Manhattan (Hudson River), Isle of Dogs (Thames River), the islands in the Mississippi River
By Climate:
* Tropical: Fiji, Maldives, Hawaii
* Temperate: Great Britain, New Zealand, Vancouver Island
* Arctic: Greenland, Iceland, Spitsbergen
This is just a small selection, and there are many more fascinating islands around the world, each with its unique features and history.