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Tröllaskagi.JPG
The peninsula is cut by several deep valleys that were formed by glaciers during ice ages and later by the rivers that now flow down those valleys. A few permanent glacier ice caps still exist in central Tröllaskagi but they are all rather small.
Human settlement is only possible in the relatively flat lowlands along the coast and in the valleys but these lowlands are densely populated by Icelandic standards with important agricultural regions and a few towns and villages that mostly base their livelihood on fisheries. Those settlements are (clockwise around the peninsula beginning in Skagafjörður): Hofsós, Hólar, Siglufjörður, Ólafsfjörður, Dalvík, Árskógssandur, Hauganes, Hjalteyri, Akureyri and Hrafnagil.
The Ring Road runs through Tröllaskagi between Siglufjörður and Eyjafjörður through a mountain pass called Öxnadalsheiði where the road reaches a maximum elevation of 540 meters above sea level which can sometimes pose a problem during wintertime. Several different tunneling projects have been suggested as a way to bypass Öxnadalsheiði.is:Tröllaskagi