From Tolkien Gateway
Aerie was an almost certainly mythical Elven realm probably invented by Bilbo Baggins for his poem Errantry where Aerie's Elven-knights dared a mariner. The name is obviously fictional, made to resemble an Elvish one.
|Legendary Locations in Arda|
|Mountains:||Astulat · Mountains of the Moon · Merlock Mountains|
|Regions:||Aerie · Belmarie · Fantasie · Last Desert · Sindanórie · Thellamie · Tode|
|Other:||Caves of the Forgotten · Gorbelgod|