panoramic view of thingvellir national park and pingvallavatn on

adventure backpack cracks destination eruption expedition field forest formation geothermal hikers hiking iceland icelandic journey lake landscape lava moos mountain national nature outdoor pano panorama panoramic park people pingvallavatn plates prehistoric ridges rock rocky scenery sightseeing spot summer tectonic tephra thingvellir tour tourists trail travel traveler trees trek trekking trip volcanic volcano