Cormorant Island is more-or-less opposite Wild Cat Island, towards the western shore of the Lake. It is much smaller than Wild Cat and is mostly rocks. Cormorants and a kingfisher nest there (see Birds in the Books) and it is also where Titty hears pirates burying treasure in Swallows and Amazons when she is onboard Amazon in the middle of the night.
It is generally agreed that Silver Holme on Windermere (just to the north and west of Blakeholme) was the original model for the islandref req. The Altounyan children used to call Maiden Holme (a tiny island just south of Belle Isle) Cormorant Islandref req.