Genesis 13:1 and 20:1 both record Abraham traveling to a region called the Negeb (or Negev depending on the English translation).
13:1 - So Abram went up from Egypt, he and his wife and all that he had, and Lot with him, into the Negeb.
20:1 - From there Abraham journeyed toward the territory of the Negeb and lived between Kadesh and Shur; and he sojourned in Gerar.
From what I can tell from a couple maps and dictionaries, the Negeb is south of the land of Israel (or perhaps on the south end of Israel?) Would this region, though, have been considered part of the wilderness where Israel wandered?