Boyd’s Bible Dictionary:
(rib). Often used as border or boundary (Judg. 11:20; 1 Sam. 5:6; Matt. 8:34).
Concise Bible Dictionary:
A term in scripture signifying any “border,” inland as well as near the sea, it also may imply large districts (Ex. 10:4; Josh. 1:4; 1 Kings 1:3).