A classic U-shaped glacial trough along the Kaiser Wilhelm Trail in the Briksdalen (the Briks Valley). The trough or valley is formed by the process of glaciation as a glacier scoured the valley with the characteristic steep, straight sides and a flat bottom. Briksdal Glacier, a tributary arm of Europe’s largest mainland glacier - Jostedalsbreen - continues to recede and is now located at the other end of the valley. Jostedalsbreen National Park. Styrn, Norway.