I Chronicles 5:11 Midrash

וּבְנֵי־גָ֣ד לְנֶגְדָּ֗ם יָֽשְׁב֛וּ בְּאֶ֥רֶץ הַבָּשָׁ֖ן עַד־סַלְכָֽה׃

And the sons of Gad dwelt over against them, in the land of Bashan unto Salcah:

Read midrashic interpretation of I Chronicles 5:11: and classical rabbinic exegesis.