Þingvellir in Iceland anglicised as Thingvellir, is a national park in the municipality of Bláskógabyggð in southwestern Iceland. Thingvellir is associated with the Althingi – the national parliament of Iceland, which was established at the site in 930 AD. Sessions were held at the location until 1798. The park lies in a rift valley that marks the crest of the Mid-Atlantic Ridge and the boundary between the North American tectonic plate and the Eurasian. It is about 40 km northeast of Reykjavík. Thingvellir is a site of historical, cultural, and geological significance, and is one of the most popular tourist destinations in Iceland. To its south lies Þingvallavatn, the largest natural lake in Iceland.
Thingvellir National Park was founded in 1930, marking the one-thousandth anniversary of the national parliament of Iceland. The park was later expanded to protect the diverse and natural phenomena in the surrounding area, and was designated as a World Heritage Site in 2004.