Þingvellir national park

water rock waterfall sea coast cliff nature terrain wave shore river rapid landscape ocean stream mountain geology þingvellir national park walk two continents iceland travel world america bridge canyon cathedral clarity cold continent continental continents crystal crystal clear water destination eurasian europe fissure glacier iceland lagoon landscape mountain national park nature outdoor people pinnacles plate ridge rift river rock scenic snow sunrise sunset tectonic tectonic plates thingvellir two underwater unesco valley volcanic volcano winter