Jamieson, Fausset and Brown on Jeremiah 6:22

22. north ... sides of the earth--The ancients were little acquainted with the north; therefore it is called the remotest regions (as the Hebrew for "sides" ought to be translated, see on Is 14:13) of the earth. The Chaldees are meant (Jr 1:15; 5:15). It is striking that the very same calamities which the Chaldeans had inflicted on Zion are threatened as the retribution to be dealt in turn to themselves by Jehovah (Jr 50:41-43).