Mine:
1. Azeroth/Outland (Warcraft)
2. Faerūn (Forgotten Realms)
3. Middle-earth (The Hobbit, The Lord of the Rings, The Silmarillion, Unfinished Tales, The Children of Hśrin)
4. Dreamlands (Celepha?s, The Dream-Quest of Unknown Kadath)
5. Earth in 2112 (Doraemon)
In no particular order.