Abraham's hometown, from which he was called to the promised land.
First mentioned in the Bible
Terah then took Abram his son and Lot his grandson, the son of Haran, and Sarai his daughter-in-law, the wife of Abram his son, and they went with him out of Ur of the Chaldeans to go to the land of Canaan. In time they came to Haran and began dwelling there.— Genesis 11:31
Background
Ur was a great city-state of Sumerian Mesopotamia, famed for its moon-god cult and towering ziggurat. Around 2000 BC, Jehovah God called Abram to leave this prosperous city and set out on a journey of faith.
Related Scriptures (New World Translation)
Terah then took Abram his son and Lot his grandson, the son of Haran, and Sarai his daughter-in-law, the wife of Abram his son, and they went with him out of Ur of the Chaldeans to go to the land of Canaan. In time they came to Haran and began dwelling there.— Genesis 11:31
Then he added: “I am Jehovah, who brought you out of Ur of the Chal·deʹans to give you this land as your possession.”— Genesis 15:7