Castanamir's Island, also called the Lost Island, is a small, rocky isle near the southwestern end of the salty Sea of Dreams, situated a few miles east of the shore. In the tenth century it was the home of a powerful mage named Castanamir who reportedly carved an elaborate underground stronghold for himself there, but both Castanamir and his entire island inexplicably disappeared without a trace in 998 YA.

Old accounts describe the surface of the island as a rocky waste, devoid of all vegetation and possessed of no animal life other than passing birds and insects.

Castanamir's Island

View across the Dreamless Sea toward the island.
Artwork by Huw Williams