Mt Dyrfjoll (The Door Mountains) are the highest mountains (1136 m) on the Borgarfjordur Bay. Their name is derived from a prominent mountain pass called The Door at 856 m above sea level. Only trained mountaineers should attempt climbing it. Very few people have stood on the highest peak.

According to the legends, the royalty of the elves or the hidden people occupies those mountain castles. Many of the younger generation believe that these mountains are the home of the Santa Claus family in Iceland.