view of the thingvallavatn, the largest natural lake, iceland

aingvallavatn aingvellir althing america area boundary cloud cultural environment eurasian europe first geological grass heritage historic iceland island islandia lake landscape largest midatlantic national natural nature north park parliament plate raagoon rain ridge rift rock southwestern tectonic thingvallavatn thingvellir tomasz tourism travel trip unesco vacation valley volcanic water wet world wozniak