Genesis 26:17

So Isaac left there and settled in the Gerar Valley. ¹ 

¹ tn Heb “and he camped in the valley of Gerar and he lived there.”

sn This valley was actually a wadi (a dry river bed where the water would flow in the rainy season, but this would have been rare in the Negev). The water table under it would have been higher than in the desert because of water soaking in during the torrents, making it easier to find water when digging wells. However, this does not minimize the blessing of the Lord, for the men of the region knew this too, but did not have the same results.