Charles Ellicott Commentary Jeremiah 49:21

"The earth trembleth at the noise of their fall; there is a cry, the noise whereof is heard in the Red Sea." — Jeremiah 49:21 (ASV)

The noise thereof was heard in the Red sea. —Literally, as in the margin, the Weedy, or Reed sea. The crash of the fall of Edom, the cries of the slaughtered people, were to be heard far off on the waters of the sea that washed its shores. Elath, on the Gulf of Akaba, was the sea-port of Edom (2 Chronicles 26:2).