A footnote on page 966 of the Artscroll chumash (this week's reading) has a map that includes the dead sea. The map shows a river flowing from the southern tip of the sea. According to a Duke U site:
The Dead Sea has no outflows ...
Is there any reason to think that such a river existed? Or, perhaps, Artscroll took a map from the web which showed the border between Israel and Jordan, and that erroneously turned into a river. Or perhaps there is another explanation. I am seeking plausible explanations.