Sforno on Genesis 12:1/ספורנו על בראשית י״ב:א׳

1אל הארץ אשר אראך, to the specific area within the country which I will show you in a heavenly vision. This is why Avram kept moving further into the land without pitching his tent to settle down until he received the appropriate sign from G’d. This occurred when he reached Shechem, where we are told that G’d appeared to him (verse 7)