Scree - ur or steinur in Norwegian - is the slope of loose, broken rock fragments that accumulates below a mountain face through millennia of freeze-thaw weathering. The fragments range from small angular gravel through fist-sized blocks to occasional larger boulders, all sitting at the slope's natural angle of repose (around 35-38 degrees for typical Norwegian gneiss and granite). The surface is unstable in a controlled way: each step settles slightly, the slope shifts under load, and the descending walker rides the upper layer in a slow controlled slide that experienced Norwegian walkers find restful and inexperienced ones find alarming.
Major scree slopes appear on most serious Norwegian mountain trails. The standard route up Galdhøpiggen crosses several scree fields above 1,800 meters; the Besseggen ridge has loose-rock sections on the descent into Memurubu; the upper sections of the Trolltunga walk include sustained mixed scree-and-bedrock. For the international visitor, the scree surface is one of the things that adds time to the published route timings: 1.5 km of scree-descent takes roughly the time of 3 km of forest trail.
The technique on serious scree is straightforward but counterintuitive: lean slightly backward, shorten the stride, allow each foot to settle before loading it, and ride the small slides rather than fight them. Trekking poles help substantially. Stiff-soled boots with gaiters are notably more comfortable than light trail shoes on sustained scree.