In the Epic of Gilgamesh, Utnapishtim’s Ark has the shape of a cube.
The flood account in the Epic of Gilgamesh describes the vessel as having equal length and width and a height matching those dimensions. It is divided into six decks, producing a cubic structure. Utnapishtim, the Mesopotamian survivor, is instructed to build the vessel before the flood sent by the god Enlil.
This differs sharply from the rectangular Ark in Genesis, whose stated proportions are 300 cubits long, 50 cubits wide, and 30 cubits high. The two stories share major motifs, including a divinely warned survivor, a large vessel, animals, a flood, and birds sent to find land, but their construction details are not identical. The Epic of Gilgamesh’s cubic design is a specific feature of its flood narrative, not a description of Noah’s Ark.