Iceland has three national parks. Vatnajökull National Park covers 13% of Iceland, making it the largest national park in Europe. It encompasses not only all of Vatnajökull glacier, Europe's largest glacier, but also extensive surrounding areas, and hides some active volcanoes, of which Bárðarbunga is the largest and Grímsvötn the most active. Þingvellir National Park is the national shrine of Iceland. It is a key location in Icelandic history as the oldest existing parliament in the world first assembled there in 930 AD. Besides being a location of historical significance, Þingvellir is also protected as a national park due to its unique geology and natural features. The Snæfellsjökull National Park, which stands at the foot of a volcano and glacier, is the only park that reaches from the seashore to the mountaintops, perfect for exploring the adventurous world of the ocean, coastline and beach.