The Skaftafell vicinity has experienced considerable volcanic activity, with the 1362 Öræfajökull eruption producing the most ash of any Icelandic volcano since the settlement and another, smaller Öræfajökull eruption occurring in 1727. As shown once again in 2011, the subglacial volcano Grímsvötn is the country's most active volcano, and is also famous for the huge jökulhlaups or glacial floods that originate from it.