Larsa is an important city of ancient Sumer, the center of the cult of the sun god Utu.

It lies some 25 km southeast of Uruk in Iraq's Dhi Qar Governorate, near the east bank of the Shatt-en-Nil canal at the site of the modern settlement Tell as-Senkereh or Sankarah.According to the Sumerian king list, "Larag" was one of the five cities to "exercise kingship" in the legendary antediluvian era.

Larsa grows powerful, but it never accumulates a large territory.

At its peak under king Rim-Sin I (ca.

1758 - 1699 BCE), Larsa controls only about 10-15 other city-states — nowhere near the territory controlled by other dynasties in Mesopotamian history.

Nevertheless, huge building projects and agricultural undertakings can be detected archaeologically.

After the defeat of Rim-Sin I by Hamurabi of Babylon, Larsa becomes a minor site, though it has been suggested that it was the home of the 1st Sealand Dynasty of Babylon.