these limbs too produced children. Ymir fed from rivers of milk that flowed from the teats of the primordial cow, Auðumbla. Auðumbla fed from salt she licked from rime stones. Over the course of three days, she licked free a beautiful and strong man, Búri. Búri's son Borr married a jötunn named Bestla, and the two had three sons: the gods Odin, Vili and Vé. The sons killed Ymir, and Ymir's blood poured across the land, producing great floods that killed all of the jötnar but two (Bergelmir and his unnamed wife, who sailed across the flooded landscape). Odin, Vili, and Vé took Ymir's corpse to the center of Ginunngagap and carved it. They made the earth from Ymir's flesh; the rocks from his bones; from his blood the sea, lakes, and oceans; and scree and stone from his molars, teeth, and remaining bone fragments. They surrounded the earth's lands with sea, forming a circle. From Ymir's skull they made the sky, which they placed above the earth in four points, each held by a dwarf (Norðri, Suðri, Austri and Vestri—Old Norse 'north, south, east, and west', respectively). After forming the dome of the Earth, the brothers Odin, Vili, and Vé took sparks of light from Muspell and placed them around the Earth, both above and below. Some remained fixed and others moved through the sky in predetermined courses. The trio provided land for the jötnar to leave by the sea. Using Ymir's eyelashes, the trio built a fortification around the center of the landmass to contain the hostility of the jötnar. They called this fortification Miðgarðr (Old Norse 'central enclosure'). Finally, from Ymir's brains, they formed the clouds. Personifications Personifications, such as those of astronomical objects, time, and water bodies occur in Norse mythology. The Sun is personified as a goddess, Sól (Old Norse 'Sun'); the moon is personified as a male entity, Máni (Old Norse 'moon'); and the Earth too is personified (Jörð, Old Norse 'earth'). Night appears personified as the female jötunn Nótt (Old Norse 'night'); day is personified as Dagr (Old Norse 'day'); and Dagr's father, the god Dellingr (Old Norse 'shining'), may in some manner personify the dawn. Bodies of water also receive personification, such as the goddess Rán, her jötunn husband Ægir, and their wave-maiden children, the Nine Daughters of Ægir and Rán. Yggdrasil Yggdrasil is a tree central to the Norse concept of