Fausset's Bible Dictionary
Salchah. Deuteronomy 3:10. A city the extreme boundary of Bashan (Joshua 13:11), and of Gad (1 Chronicles 5:11). The district also (Joshua 12:5). The modern Salchah, Sulkhad, or Sarkhad, is seven hours' journey S.E. of Bozrah. Above the town on a volcanic hill, 400 ft. above the surrounding ground, an offshoot from the Bashan mountains, is a strong castle on the edge of the Euphrates desert, commanding a view of any foe who might approach, almost a day's journey off. The town is two or three miles hi circumference at the S. end of the jebel Hauran.
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Fausset, Andrew R. Entry for 'Salcah'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/s/salcah.html. 1949.