Joshua 15:5

And the east border [was] the salt sea, [even] unto the end of
Jordan
To the place where Jordan fell into it; so that this border was the whole length of the salt sea, which Josephus says ^F25 was five hundred eighty furlongs; and, according to Pliny ^F26, an hundred miles:

and [their] border in the north quarter [was] from the bay of the sea,
at the uttermost part of Jordan;
this northern border began where the eastern ended, at the bay or creek of the sea, where Jordan fell into it.