Albert Barnes Commentary Jeremiah 50:19

"And I will bring Israel again to his pasture, and he shall feed on Carmel and Bashan, and his soul shall be satisfied upon the hills of Ephraim and in Gilead." — Jeremiah 50:19 (ASV)

Or, "I will bring Israel (the scared sheep) back to his pasturage and he shall graze etc." The places named are the districts of Palestine most famous for their rich herbage.