Thematic Bible: Often covered to prevent their being filled with sand

And there he saw a water-hole in a field, and by the side of it three flocks of sheep, for there they got water for the sheep: and on the mouth of the water-hole there was a great stone. And all the flocks would come together there, and when the stone had been rolled away, they would give the sheep water, and put the stone back again in its place on the mouth of the water-hole.