Þingvellir (Thingvellir) is a place in Bláskógabyggð in southwestern Iceland, near the peninsula of Reykjanes and the Hengill volcanic area. Þingvellir is a site of historical, cultural, and geological importance and is one of the most popular tourist destinations in Iceland. It is the site of a rift valley that marks the crest of the Mid-Atlantic Ridge. It is also home to Þingvallavatn, the largest natural lake in Iceland.Þingvallavatn, the largest natural lake in Iceland. Picture source
The continental drift between the North American and Eurasian Plates can be clearly seen in the cracks or faults which traverse the region, the biggest one, Almannagjá, being a veritable canyon. This also causes the often-measurable earthquakes in the area.
Almannagjá. Picture source
Silfra crack, Þingvellir Lake. Read more at Dive.is.
In this video you will see scuba diving in Silfra the clearest water on earth!
Parliament or Alþingi was established at Þingvellir in 930 and remained there until 1789. Þingvellir National Park was founded in 1930 to protect the remains of the parliament site and was later expanded to protect natural phenomena in the surrounding area.
Öxarárfoss. Picture source
Þingvellir National Park was the first national park in Iceland and was decreed “a protected national shrine for all Icelanders, the perpetual property of the Icelandic nation under the preservation of parliament, never to be sold or mortgaged. Read more on Wikipedia