Genesis 26:18

And Isaac digged again the wells of water, which they had digged in the days of Abraham, his father; for the Philistines had stopped them after the death of Abraham, thus disregarding the covenant which had been made between them and Abraham, Genesis 21:22. And he called their names after the names by which his father had called them. Having gone over the field often while his father was yet alive, Isaac was familiar with the entire country.