Which ancient Mesopotamian epic features Utnapishtim's flood vessel, a story often compared with Noah's Ark?

The Epic of Gilgamesh features Utnapishtim's flood vessel, a story often compared with Noah's Ark.

In the flood episode of the Epic of Gilgamesh, the god Ea warns Utnapishtim to build a vessel and preserve living creatures, family members, and skilled workers. After the flood, Utnapishtim sends out birds to discover whether the waters have receded. These motifs invite comparison with the Genesis account of Noah.

The comparison is not a claim that the two narratives are identical. The Mesopotamian text has different gods, characters, vessel specifications, and theological purposes. The Epic of Gilgamesh also exists in multiple textual traditions, preserved on clay tablets in cuneiform.

The relationship between the stories is studied within the wider history of ancient Near Eastern flood traditions. The most specific answer to the question is the Epic of Gilgamesh, not the separate Mesopotamian Atrahasis epic, although that work also contains a flood narrative.