Hwergelmer
Hwergelmer in Norse mythology, is the spring in the centre of Helheim and Niflbeim, in which the drops collect that fall from the antlers of the reindeer Aeikthyrner. There are so many of them that the spring supplies thirty- seven rivers of hell. The spring is inhabited by many snakes, who gnaw at the root of the world ash-tree, Ygdrasil.