Thingvellir (Þingvellir), is a place in the administrative district of "Bláskógabyggð" in southwestern Iceland, near the Reykjanes peninsula and the Hengill volcanic area. Thingvellir is a site of historical, cultural, and geological importance and is one of the most popular tourist destinations in Iceland. It lies in a rift valley that marks the crest of the Mid-Atlantic Ridge. It is at the northern end of Þingvallavatn, the largest natural lake in Iceland.
Althing, the Icelandic Parliament, was established at Thingvellir in 930, and remained there until 1798. Thingvellir National Park was founded in 1930, marking the 1,000th anniversary of the Althing. It was later expanded to protect natural phenomena in the surrounding area, and became a World Heritage Site in 2004.