colorful rhyolit red, orange and yellow fumarole at reykjadalur valley with sharp rocks, grass meadow and geothermal

activity background blue color colorful environment fumarola fumarole fumaroles geology geothermal grass green hike hiking hot hveragerdi hverageri iceland icelandic landscape natural nature orange outdoor park pool red reykjadalur rhyolit river spring steam stream summer therma thermal tourism tourist trail travel trekking valley vivid volcanic water yellow