Joshua 15:2

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

Joshua 12:3

12:3 His kingdom included the eastern Arabah from the Sea of Kinnereth to the Sea of the Arabah (the Salt Sea), including the route to Beth Jeshimoth and the area southward below the slopes of Pisgah.

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,