Gerah @ a bean, probably of the carob tree, the smallest weight, and also the smallest piece of money, among the Hebrews, equal to the twentieth part of a shekel Exodus:30:13; Leviticus:27:25; Numbers:3:47). This word came into use in the same way as our word "grain," from a grain of wheat.
Gerar @ a region; lodging-place, a very ancient town and district in the south border of Palestine, which was ruled over by a king named Abimelech Genesis:10:19Genesis:20:1-2). Abraham sojourned here, and perhaps Isaac was born in this place. Both of these patriarchs were guilty of the sin of here denying their wives, and both of them entered into a treaty with the king before they departed to Beersheba (21:23-34; 26). It seems to have been a rich pastoral country ( 2Chronicals:14:12-18). Isaac here reaped an hundred-fold, and was blessed of God Genesis:26:12). The "valley of Gerar" Genesis:26:17) was probably the modern Wady el-Jerdr.