יהושע טו:ב פירוש: רש״י

And their southern border was. Referring to the southern border of Yehudah.

From the end of the Salt (Dead) Sea. Referring to the southeastern corner of Eretz Yisroel as stated in Parshas אֵלֶה מַסְעֵי²See Bamidbar 34:12.

From the bay—of the sea.