Þingvellir is located in southwest Iceland. A surface feature of the Mid-Atlantic Ridge can be seen here, where the North American and Eurasian plates are currently diverging. The site also holds cultural significance, being a hub for Icelanders to gather and to legislate during the Commonwealth period (~930 - 1271 A.D.).
The most active of the two large geysers in the Haukadalur valley. Strokkur reliably erupts every five to ten minutes, launching a column of water up ~ 15 - 20 m into the air.
Geysir is the first geyser known to be described in print and is where the word geyser is derived. Not nearly as active as its neighbor, Strokkur, often stopping for years at a time. When it does erupt, water can be thrown up to 70 m high.