In which city did Enheduanna, the first known named author, serve as priestess?

Ur was a major Sumerian city-state in ancient Mesopotamia, located at the site of modern Tell el-Muqayyar in Dhi Qar Governorate, Iraq. Although Ur was a coastal city near the mouth of the Euphrates on the Persian Gulf, the coastline has shifted and the site is now well inland, on the south bank of the Euphrates, 16 km (10 mi) southwest of the city of Nasiriyah. The city dates from the Ubaid period c. 3800 BC, and is recorded in written history as a city-state from the 26th century BC, its first recorded king being Mesannepada.