Read Joshua 18:12 Using Other Translations
And their border on the north side was from Jordan; and the border went up to the side of Jericho on the north side, and went up through the mountains westward; and the goings out thereof were at the wilderness of Bethaven.
On the north side their boundary began at the Jordan. Then the boundary goes up to the shoulder north of Jericho, then up through the hill country westward, and it ends at the wilderness of Beth-aven.
The northern boundary of Benjamin’s land began at the Jordan River, went north of the slope of Jericho, then west through the hill country and the wilderness of Beth-aven.