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 (Gen 10:19; 20:1; 20:2). 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 (Gen 21:23-34; 26:1etc.). It seems to have been a rich pastoral country (2Chr 14:12-18). Isaac here reaped an hundred-fold, and was blessed of God (Gen 26:12). The "valley of Gerar" (Gen 26:17) was probably the modern Wady el-Jerdr.

EBD - Easton's Bible Dictionary