New Revised Standard Version
Abner and his men traveled all that night through the Arabah; they crossed the Jordan, and, marching the whole forenoon, they came to Mahanaim.

Contemporary English Version
Abner and his troops marched through the Jordan River valley all that night. Then they crossed the river and marched all morning until they arrived back at Mahanaim.

New American Bible
Abner and his men marched all night long through the Arabah, crossed the Jordan, marched all through the morning, and came to Mahanaim.

Douay-Rheims Bible
And Abner and his men walked all that night through the plains: and they passed the Jordan, and having gone through all Beth-horon, came to the camp.

And Abner and his men walked all that night through the plains: and they passed the Jordan, and having gone through all Beth-horon, came to the camp.

Bithron.

18 miles from the former, and

2 Samuel 2:22 And again Abner said to Asael: Go off, and do not follow me, lest I be obliged to stab thee to the ground, and I shall not be able to hold up my face to Joab thy brother.

from the latter. The Jerusalem Itinerary mentions a place called {Bethar},

16 miles from Caesarea, and

2 Samuel 2:20 And Abner looked behind him, and said: Art thou Asael? And he answered: I am.

from Diospolis, which is probably the same. The Talmudists say that it was four miles distant from the sea.

Songs 2:17 Till the day break, and the shadows retire. Return: be like, my beloved, to a roe, or to a young hart upon the mountains of Bether.

Bether

2 Samuel 2:12 And Abner the son of Ner, and the servants of Isboseth the son of Saul, went out from the camp to Gabaon.