þingvellir National Park is sited in a rift valley and lies on the tectonic boundaries of the Mid-Atlantic ridge. Iceland is where the Eurasian and North American tectonic plates meet. Earthquakes occur along the plate boundaries in Iceland. At þingvellir, the tectonic plates are pulling apart. Also in þingvellir, is Lake Þingvallavatn, the largest natural lake in Iceland, with a diverse ecosystem.
It is an important location for the country’s history. In 930 AD, the Alþing (Althing) general assembly – Europe’s oldest (outdoor) Parliament began in this area.