Mount Mashu is the great "cedar mountain" which the hero-king Gilgamesh passes via a tunnel on his journey to Dilmun, the Garden of the Gods, from Mesopotamian mythology. This occurs after leaving the Cedar Forest where Humbab was.

Gilgamesh's journey to Dilmun was twelve leagues long, through the mountain in utter darkness. Before that at the entrance to the mountain, two Scorpion-Men stood.