Albert Barnes Commentary Jeremiah 49:4

"Wherefore gloriest thou in the valleys, thy flowing valley, O backsliding daughter? that trusted in her treasures, [saying], Who shall come unto me?" — Jeremiah 49:4 (ASV)

Thy flowing valley - The (fertile) valley in which Rabbah was situated. The Septuagint again has: in the valleys of the Anakim, as in Jeremiah 47:5 (see the note).