创世记 14:3

עמק השדים VALE OF SIDDIM — So it was named because it contained many fields (שדות) There are many Midrashic explanations of this name. הוא ים המלח THE SAME IS THE SALT SEA — After some time the sea flowed into it (the vale) and thus the Salt Sea came into existence. The Midrashic explanation states that the rocks that surrounded it had cracked and streams thus flowed into it (Genesis Rabbah 42:5).

כׇּל־אֵ֙לֶּה֙ חָֽבְר֔וּ אֶל־עֵ֖מֶק הַשִּׂדִּ֑ים ה֖וּא יָ֥ם הַמֶּֽלַח׃

All these were joined together in the vale of Siddim, which is the salt sea.