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, 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 (2 Chr. 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.
   

Gerar, same as Gera