HERMUS, (anc. geog.), a river of Ionia; which rising near Dorylæum, a town of Phrygia, in a mountain sacred to Dindymene or Cybele, touched Mylia, and ran through the Regio Combulta, then through the plains of Smyrna down to the sea, carrying along with it the Pactolus, Hyllus, and other less noble rivers. Its waters were said to roll down gold, by Virgil and other poets.