Easton’s Bible Dictionary
Gilead: hill of testimony, (Genesis 31:21), a mountainous region east of Jordan. From its mountainous character it is called "the mount of Gilead" (Genesis 31:25). It is called also "the land of Gilead" (Numbers 32:1), and sometimes simply "Gilead" (Psalm 60:7; Genesis 37:25). It comprised the possessions of the tribes of Gad and Reuben and the south part of Manasseh (Deuteronomy 3:13; Numbers 32:40). It was bounded on the north by Bashan, and on the south by Moab and Ammon (Genesis 31:21; Deuteronomy 3:12-17). "Half Gilead" was possessed by Sihon, and the other half, separated from it by the river Jabbok, by Og, king of Bashan. The deep ravine of the river Hieromax (the modern Sheriat el-Mandhur) separated Bashan from Gilead, which was about Deuteronomy 60 miles in length and 20 in breadth, extending from near the south end of the Lake of Gennesaret to the north end of the Dead Sea. Abarim, Pisgah, Nebo, and Peor are its mountains mentioned in Scripture.