Mashu, as described in the Epic of Gilgamesh of Mesopotamian mythology, is a great cedar mountain through which the hero-king Gilgamesh passes via a tunnel on his journey to Dilmun after leaving the Cedar Forest, a forest of ten thousand leagues span.[1] Siduri, the Alewife, lived on the shore, associated with "the Waters of Death" that Gilgamesh had to cross to reach Utnapishtim, the far-away.[2]