The Cold Valley is the westernmost and the shortest of the three main routes across the interior from south to north. It lies between the mountain Ok and The Long Glacier and its highest elevation is 727 m. Usually it is passable for most vehicles three to five months of the year.

The Cold Valley route was much travelled in the past, especially between the inland located farms of the West and Northwest, and the Parliamentary Plains area. It was the first one to be made permanent with road building in 1830. The view from the highest lying point (727 m) enroute is excellent on a fine day. A few legends and Sagas are connected with this part of the country. A side road to the east from the main route leads to a hut at the edge of The Long Glacier, where adventurous glacier tours are on offer.

Thingvellir < to > Husafell 65 km via Kaldidalur.