A Midrash taught that , , and call the Euphrates "the Great River" because it encompasses the Land of Israel. The Midrash noted that at the creation of the world, the Euphrates was not designated "great." But it is called "great" because it encompasses the Land of Israel, which calls a "great nation." As a popular saying said, the king's servant is a king, and thus Scripture calls the Euphrates great because of its association with the great nation of Israel.