According to Irish legend, Rowan trees once dropped their bright red berries into a sparkling well full of salmon. Fish that gulped the fruit would gain red spots and great wisdom, and men labored to catch and eat these "fish of knowledge." But women were barred from catching the salmon. One day, however, a brave rebel name Sionan caught and ate one of the wise fish. The next moment, a great flood burst from the well forever carrying her westward to the sea. So did Ireland's longest waterway, the River Shannon, earn her name.