Larsa

Larsa (Sumerian: 𒌓𒀕𒆠, romanized: UD.UNUG, read Larsam), also referred to as Larancha/Laranchon (Gk. Λαραγχων) by Berossos and connected with the biblical Ellasar, was an important city-state of ancient Sumer, the center of the cult of the sun godUtu with his temple E-babbar. It lies some 25 km (16 mi) 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.

Larsa is thought to be the source of a number of tablets involving Babylonian mathematics, including the Plimpton 322 tablet that contains patterns of Pythagorean triples.