One of the Rhineland's main attractions lies 4 km (2½ mi) south of St. Goarshausen: the steep (430-foot-high) slate cliff named after the beautiful blond nymph Loreley. Here she supposedly sat, singing songs so lovely that sailors and fishermen were lured to the treacherous rapids—and their demise. The rapids really were treacherous: the Rhine is at its narrowest here and the current the swiftest. The Loreley nymph was invented in 1801 by author Clemens Brentano, who drew his inspiration from the sirens of Greek legend. Her tale was retold as a ballad by Heinrich Heine and set to music by Friedrich Silcher at the height of Rhine Romanticism in the 19th century. The haunting melody is played on the PA systems of the Rhine boats whenever the Loreley is approached.