Odin and his brothers, Vili and Ve, are attributed with slaying Ymir, the Ancient Giant, to form Midgard. From Ymir's flesh, the brothers made the earth, and from his shattered bones and teeth they made the rocks and stones. From Ymir's blood, they made the rivers and lakes. Ymir's skull was made into the sky, secured at four points by four dwarfs named East, West, North, and South. From Ymir's brains, the three Gods shaped the clouds, whereas Ymir's eye-brows became a barrier between Jotunheim (giant's home) and Midgard, the place where men now dwell. Odin and his brothers are also attributed with making humans.