An enclosure; a wall, a part, probably, of the Arabian desert, on the north-eastern border of Egypt, giving its name to a wilderness extending from Egypt toward Philistia ( Genesis 16:7 ; 20:1 ; 25:18 ; Ex.15:22). The name was probably given to it from the wall (or shur) which the Egyptians built to defend their frontier on the north-east from the desert tribes. This wall or line of fortifications extended from Pelusium to Heliopolis. (https://www.biblestudytools.com/dictionary/shur/)
The Lord sees Hagar
Hagar fled to the wilderness from her harsh mistress Sarai when pregnant with Ishmael. The angel of the Lord saw her there by a spring of water on the way to Shur. The well was called Beer-lahai-roi, and it lies between Kadesh and Bered. (Genesis 16)
Abraham sojourns in Gerar
From the spot he mediated on behalf of the righteous in Sodom and Gomorrah, Abraham journeyed toward the territory of the Negeb and lived between Kadesh and Shur; and he sojourned in Gerar where Abimelech took and returned Sarah.
Ishmael's sons settle from Havilah to Shur
Ishmael's sons, the twelve princes Nebaioth, Kedar, Adbeel, Mibsam, Mishma, Dumah, Massa, Hadad, Tema, Jetur, Naphish, and Kedemah, settle from Havilah to Shur, which is opposite Egypt in the direction of Assyria. (Genesis 25:13-18)
As Saul is called to destroy the Amalekites, he defeats them from Havilah to Shur
Samuel told Saul the LORD wanted him to destroy Amalek and all their livestock. He summoned his forces to Telaim and, after warning the Kenites to flee, Saul and two hundred thousand foot soldiers and ten thousand men of Judah defeated the Amalekites from Havilah as far as Shur. (1 Samuel 15)
As David hides in Ziklag, his men raid the Geshurites, Girzites, and Amalekites as far as Shur
After fleeing from Saul to Philistia with Achish the son of Maoch, king of Gath, David made Ziklag his base of operations for military exploits against the Geshurites, Girzites, and Amalekites as far as Shur, to the land of Egypt. He reported his raids back to Achish as against the Negeb of Judah, Jerahmeelites, and Kenites and gained Achish's trust. (1 Samuel 27)