# Grímsvötn

- **Country:** Iceland
- **Coordinates:** 64.420000, -17.330000
- **Text:** Geological features near the Grímsvötn central volcano and its fissure swarm (red outlines). The fissure swarm's recent surface lava flows are shaded violet (darker if more recent, vents violet outline).
- **Type:** Volcanic caldera
- **Listing:** List of volcanoes in Iceland
- **Location:** Austur-Skaftafellssýsla / Vestur-Skaftafellssýsla, Iceland
- **Image Map:** {{maplink|frame=yes|frame-align=center|frame-width=260|frame-height=340|frame-long=-17.3|frame-lat=64.2|zoom=7|raw=[,,,,,,]
- **Map Relief:** 1
- **Elevation M:** 1725
- **Last Eruption:** May 2011
- **Label Position:** right

In September 2021, an increase in water outflow from under the Vatnajökull ice cap was reported. The water contains elevated levels of dissolved hydrogen sulfide, suggesting increased volcanic activity under the ice. Jökulhlaup (glacial lake flooding) can occur before or after an eruption.

![Photo of Grímsvötn](https://upload.wikimedia.org/wikipedia/commons/6/6e/Iceland_Grimsvoetn_1972-B.jpg)

**Source:** https://en.wikipedia.org/wiki/Grímsvötn (Wikipedia, CC BY-SA)