sal.khah is a proper place name marking the extent or territory of Bashan in the cited passages.

The attested form is a proper place name used in territorial descriptions: it marks an extent of Bashan, is listed among lands under a ruler, and identifies where the sons of Gad lived.

1. Place name in territorial descriptions · dominant

   All four occurrences are tagged Noun · Proper. In Deuteronomy 3:10 and Joshua 13:11, the APB renders Bashan's extent as reaching “as far as Salecah”; Joshua 12:5 lists it within a ruler's territory, while 1 Chronicles 5:11 places the sons of Gad in Bashan “as far as Salecah.”

   1 Chronicles 5:11Deuteronomy 3:10Joshua 12:5Joshua 13:11

In the Anselm Project Bible: The APB presents the form as “Salecah” in each cited verse, either after “as far as” in territorial statements or in a list of lands under rule. This consistently confirms the verse-level presentation of a place name rather than a finer lexical nuance.