The Jordan was its border on the east side. This was the inheritance of the children of Benjamin, according to its boundaries all around, according to their families.
Joshua 18:20
Surrounding context
18:19 And the border passed along to the north side of Beth Hoglah; then the border ended at the north bay at the Salt Sea, at the south end of the Jordan. This was the southern boundary.
18:20 The Jordan was its border on the east side. This was the inheritance of the children of Benjamin, according to its boundaries all around, according to their families.
18:21 Now the cities of the tribe of the children of Benjamin, according to their families, were Jericho, Beth Hoglah, Emek Keziz,