Genesis 26:15

It is said that Arabs still fill up the wells on pilgrimage roads, if they do not receive the toll they demand. The conduct of Abimelech's people was a violation of the agreement of Genesis 21:25. Geikie, in his 'Hours with the Bible,' gives some interesting information respecting wells in Palestine:—'The upper porous limestone of the central hills, and indeed of Palestine generally, allows the rain to a large extent to filter through it to an underlying sheet of hard limestone, which slopes towards the sea, forming a shelf on which the water flows in a subterranean stream below the whole coastplain from N. to S. Hence it is only necessary to sink a well to reach a copious supply of living water.'