Arnardalur is located 25 km south of farm Modrudalur a Fjollum.
Bordering it to the east is a sand and gravel ridge called
Dyngjuhals and to the west are the Arnardalur Mountains.
The valley floor is a somewhat vegetated, flat plain through which
River Arnardalsa runs. It
collects some spring water from Dyngja and River Thrihyrningsa.
Just above the confluence with Glacial River Jokulsa a Fjollum, a
waterfall decorates River Arnardalsa.
Traces of human inhabitancy of the valley were discovered at
Dyngja. Heaps of bones of horses,
sheep, whooper swans and geese along with net weights made of sheep bones
and charcoal, probably from a garbage heap, were among the things
written sources reveal the inhabitancy of the valley, but a legend tells
us about the farmer at Bru in the Jokuldalur Valley, who fled with his
people into the interior during the second plague in the
century. According to this
legend, he spent one year in Dyngja and two years at Netsel on Lake
Anavatn before returning to Bru.
road to the south from farm Modrudalur (100 km; 60 miles) ends at the
northern edge of Glacier Vatnajokull, at the Kverkfjoll mountain massif.