The Simoeis was a small river of the ancient Troad, having its source in Mount Ida, or more accurately in Mount Cotylus, which passed by Troy, joined the Scamander River below that city. This river is frequently spoken of in the Iliad, and described as a rapid mountain torrent. The river is also noted by the ancient geographers Strabo, Ptolemy, Stephanus of Byzantium, Pomponius Mela, and Pliny the Elder. Its present course is so altered that it is no longer a tributary of the Scamander, but flows directly into the Hellespont.