Concise Bible Dictionary:
1. The early name of the long range of mountains, extending from about eight miles, south of the Salt Sea, to near the Gulf of Akaba. It is also called “the land of Seir.” It was occupied at first by the Horites, and afterward by the descendants of Esau, and acquired the name of EDOM. The Israelites had to compass the whole of this mountainous range to reach their entrance to the promised land (Gen. 14:6; Gen. 36:8-9, 30; Deut. 2:1-12). The word of Jehovah announced to the prophet the perpetual desolation of Mount Seir (Ezek. 35:2-15).
2. A northern boundary of Judah (Josh. 15:10). Probably the ridge north of Kirjath-jearim, about 31° 47' N.