Wikipedia
Zaratan
The Zaratan is a grandiose sea turtle found in literature and folk lore. Zaratans are notable for their long-life span and impossible size. Zaratan shells are easily mistaken for small islands, similar to the whale-like Fastitocalon. The Zaratan is catalogued in Jorge Luis Borges's El Libro de Los Seres Imaginarios ( The Book of Imaginary Beings).
Zaratan (Dungeons & Dragons)
A zaratan is an enormous, passive turtle from the fictional Dungeons & Dragons fantasy role playing game, based on the legendary zaratan.