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). Zaratans also appear in some editions of the tabletop roleplaying game "Dungeons & Dragons".
In addition, Al-Jahiz, an Arab prose writer and zoologist in the 9th century, described Zaratan as an innocent story in his book "Kitāb al-Hayawān" ("The Book of Animals"). His record is one of the oldest legends of Zaratan.