Which ancient Mesopotamian epic features Utnapishtim surviving a great flood in a vessel?

The Epic of Gilgamesh features Utnapishtim surviving a great flood in a vessel.

In the flood story within the Epic of Gilgamesh, the god Ea warns Utnapishtim to build a large boat and preserve life. Utnapishtim survives the flood with his family, craftsmen, and animals, then releases birds to learn whether the waters have receded. The episode is one of the best-known ancient Mesopotamian flood narratives.

The story is often compared with Noah’s Ark because both accounts include divine warnings, a large survival vessel, a flood, preserved living beings, and birds sent after the waters rise. They are not the same text, characters, or religious tradition. Noah is the survivor in Genesis, while Utnapishtim is the survivor in Gilgamesh.

The Epic of Gilgamesh also contains a separate older flood tradition preserved in the Epic of Atrahasis. That neighboring work is why “Epic of Atrahasis” can sound plausible, but the question asks for the specific epic in which the survivor is Utnapishtim.