Jökulsárgljúfur is the northernmost part of Vatnajökull National Park, with separate boundaries, but geographically connected to the rest of the park by the glacial river Jökulsá á Fjöllum. The river’s source is in Vatnajökull glacier, near the subglacial volcano Bárdarbunga. Jökulsárgljúfur literally transcribes as Glacial-River-Canyon. This canyon is 25 km long, 500 m wide and in many places 100-120 m deep, making it one of the deepest and most breath-taking canyons in Iceland. Jökulsárgljúfur is also known for its series of waterfalls: Selfoss, Dettifoss, Hafragilsfoss, and Réttarfoss.