Thordarhyrna
| Thordarhyrna | |
|---|---|
| Þórðarhyrna | |
| Highest point | |
| Elevation | 1,650 m (5,410 ft) |
| Listing | List of volcanoes in Iceland |
| Coordinates | 64°12′4″N 17°0′17″W / 64.20111°N 17.00472°W |
| Geography | |
| Geology | |
| Mountain type | Subglacial volcano/Icelandic stratovolcano |
| Last eruption | 1904 |
Thordarhyrna (Icelandic: Þórðarhyrna [ˈθourðarˌhɪ(r)tna] ⓘ) is one of seven subglacial volcanoes beneath the Vatnajokull glacier in Iceland. It is a paired active central volcano with Grímsvötn, and can be classified as part of the Grímsvötn-Laki volcanic system, with common fissure swarms to the south.