Fire Island is situated in a steaming sulfurous lake. Its glowing sands are inhabited by Fire People who are composed of red and blue flames. Instead of houses, they live in open fireplaces. They snack on firecrackers.
The island has its own ecology, with fire flowers, grown in beds of red-hot coals, that produce yellow, blue, and red blooms on firey green stems. Fireflies are common.
Human visitors to Fire Island would be burnt up, unless they are protected with an effective counter-agent. (Grampa in Oz)