Vltava is a river which flows through the Czech Republic and its capital city , Prague . Composer BedÅ ich Smetana wrote a symphonic poem about this river , sometimes called `` The Moldau '' . The best-known of the classical Czech composer BedÅ ich Smetana 's set of six symphonic poems MÃ vlast ( `` My Motherland '' ) is called Vltava ( or The Moldau ) , and is a musical depiction of the river 's course through Bohemia .