Through the plain - See 1 Samuel 23:24. Bithron is unknown. From the expression all (the) Bithron, it seems likely that it is a tract of country, intersected by ravines lying on the east side of Jordan.
Related Commentaries of 2 Samuel 2:29
2 Samuel 2:29
29 And Abner and his men walked all that night through the plain, and passed over Jordan, and went through all Bithron, and they came to Mahanaim.