floating island

Short definition from Wiktionary

Noun

1. 1
   An aggregation of driftwood and roots, or vegetation, capable of bearing soil, which floats on the surface of (bog or lake) water or is floated out from a river delta or similar.
2. 2
   A French cold dessert consisting of an "island" of meringue, made of egg whites and sugar, floating in a "sea" of custard.
3. 3
   Synonym of kitchen island.