Principal high-temperature areas
- Reykjanes
- Krýsuvík / Trölladyngja
- Brennisteinsfjöll
- Hengill
- Torfajökull
- Hágöngur
- Vonarskarð
- Námafjall
- Krafla
- Þeistareykir
The boundaries between high-temperature areas are not always sharp. The Hengill area, for instance, is sometimes treated as one large field spanning Nesjavellir, Innstidalur, Kolviðarhóll, Hveradalir, Hverahlíð, Ölkelduháls and Grændalur.