Falak

In Islamic mythology, Falak is the cosmic serpent that is responsible for building the adamantine walls of the Realm of Fire. Beneath the sea is the Realm of Fire and it is there were the Falak lives. It is said that the Falak is so hungry that it was not for the fear of Allah he would consume the whole world.

John and Caitlin Matthews, The Element Encyclopaedia of Magical Creatures, 2013, Falak, p 173