Joshua 15:2

15:2 Their southern border started at the southern tip of the Salt Sea,

Joshua 18:19

18:19 It then crossed to the slope of Beth Hoglah to the north and ended at the northern tip of the Salt Sea at the mouth of the Jordan River. This was the southern border.

Joshua 15:5

15:5 The eastern border was the Salt Sea to the mouth of the Jordan River.

The northern border started north of the Salt Sea at the mouth of the Jordan,