The Öxará in winter
Thingvellir area is part of a fissure zone running through Iceland, being situated on the tectonic plate boundaries. This place is a site of historical, cultural and geological importance and became a UNESCO World Heritage Site in 2004. A Parliament was established at Thingvellir in 930 and remained there until 1798. The Öxará (a river), a tributary of Lake Þingvallavatn, descends to the rift forming Öxarárfoss, a waterfall.