Natural pool Grjótagjá, crevices, hot fountain, Reykjahlíð, Mývatni, Iceland, Europe

caves cave cleft crevices europe famous place geothermal area grjótagjá hot spring hot icelandic iceland lakes lake mirroring mirrors mirror myvatn mývatni natural landmarks natural landmark nature nobody no one no people place of interest reflecting reflections reflection reflects reflect regions region rocks rocky rock sights sight source springs spring thermal areas thermal area thermal springs thermal spring waters water Ísland