Adam Clarke on Jeremiah 49:34

The Word - Against Elam - Another new head of prophecy. As this was delivered in the beginning of the reign of Zedekiah, it can have no natural nor historical connection with the other prophecies in this various chapter. Some think that by Elam Persia is always meant; but this is not at all likely. It was a part of the Babylonian empire in the time of Daniel, (Dan 8:2), and is most probably what is called Elymais by the Greeks. This, with Susiana, Nebuchadnezzar subdued, and took from Astyages, king of Media.