i've heard it suggested that the caldera of Tenerife in the Canary Islands was one place, at least, the one the greeks called Tartarus (occurs repeatedly in the new testament translated as hell) and no coincidence that there is a body of water separating it from the rest of the world, or that dogs feature prominently - the hounds of hell, Hades, the name Canary Islands refers to the dogs that are still popular and common all over the atlantic islands