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The feature numbered 2 in the upper left part of this figure is U-shaped valley.
Glacial troughs, also known as trough valleys or glacial troughs, are generated by the glacial process. They are distinctive of glaciation in mountains in particular. They have a distinctive cross-sectional shape of a U, with steep, straight sides and a flat or rounded bottom. Glaciated valleys are created when a glacier carries out a scouring motion while moving across and down a slope. The valley is left behind as the ice melts or retreats, and it is frequently covered in small rocks known as glacial till or glacial erratic that were carried by the glacier. The Norwegian word for these features, which are typical in Norway, is "fjord," and it refers to when a U-shaped valley stretches into saltwater and becomes an inlet of the sea.
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