4km east of Keilir. Drive road 41
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Two hyaloclastite mountains north of Núpshlíð or Vesturhálsi.

Grænadyngja is between Núpshlíðarháls og Trölladyngju en then there is Sog.  There are supposed to be many volcanos and geothermal heat. Popular for hiking since the flatness of the surrounding area makes a fantastic view.

Location: 4km east of Mt Keilir. Drive road 41.