Thyamis River near Ioannina, Greece

© Hercules Milas/Alamy - 2013-09-01

body of water natural landscape nature water resources watercourse water stream river vegetation nature reserve rock waterfall riparian zone rapid landscape moss national park plant formation fluvial landforms of streams creek riparian forest state park forest tributary reflection water feature arroyo valdivian temperate rain forest ravine non-vascular land plant