is the name for grazing lands on the west side of Skagafjörður, Iceland between Sæmundarhlíð in the east and Laxárdalsfjall mountain in the west. The main part of used to belong to Reynistaður, which the area is named for, and it is sometimes called ( mountains). It is now part of the plain and is owned by several municipalities in western .
Multiple valleys run through . valley is in the westernmost part of and it is around 15 kilometers long, running mostly from north to south. Hryggjadalur valley is northeast of and its outermost part belongs to . , a mountainous area, is east of and around 10 kilometers long. East of are smaller valleys: Rangali and in the north, then Vatnadalur and Valbrandsdalur, and Þröngidalur in the south. To the east, there are the mountains and north of those, there is , a mountain overlooking .
One of 's valleys is . It is a deserted valley on the border between Skagafjörður and Austur-Húnavatnssýsla counties. The valley runs approximately north to south and is just over 15 kilometers long. For the most part, the valley is 250–320 meters above sea level and rather wide, and some areas of the valley floor have lots of vegetation.
was considerably settled in the Middle Ages and one of the farms there, , even had a church. There was no mention of in the historical record until a letter from the scholar Björn Jónsson from Skarðsá from the middle of the 17th century. It is uncertain when became abandoned, which may have been the result of a wave of plague that afflicted the whole valley. The valley is now completely abandoned, likely because of the Black Death in 1402 or the second plague during 1495–1496. Afterwards, there were usually only one or two farms left in the area. The ridges, which are in Hryggjadalur valley, became abandoned in 1913. , in the very north of the valley and—for the longest time—the only farm in Hryggjadalur, was abandoned in 1898.
There are ruins and hay fields of some of the farms still visible, including: , and possibly .
The Travel Association now has a lodge in in .
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