Bahamut

The fish (Bahamut) carries on its back the giant bull (Kuyuta), and on the green hyacinth slab stands an earth-bearing angel.
—Surüri's Turkish translation of al-Qazwini. Topkapi Palace Museum, Istanbul, MSSA A 3632, folio 131a

Bahamut, or Bahamoot (/bəˈhɑːmuːt/ bə-HAH-moot; Arabic: بهموت), according to Zakariya al-Qazwini, is a monster that lies deep below, underpinning the support structure that holds up the earth.

In this conception of the world, the earth is shouldered by an angel, who stands on a slab of gemstone, which is supported by the cosmic beast (ox) sometimes called Kuyutha'(/Kuyuthan)/Kiyuban/Kibuthan (plausibly a corruption or misrendering of Hebrew לִוְיָתָן "Leviathan"). Bahamut carries this bull on its back, and is suspended in water for its own stability.

Balhūt is a variant name found in some cosmographies. In the earliest sources, the name is Lutīyā, with Balhūt given as a byname and Bahamūt as a nickname.