Deep valleys carved out by rivers.
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U-shaped valleys, trough valleys or glacial troughs, are formed by the process of glaciation. ... They have a characteristic U shape in cross-section, with steep, straight sides and a flat or rounded bottom (by contrast, valleys carved by rivers tend to be V-shaped in cross-section).
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A valley is an elongated low area often running between hills or mountains, which will typically contain a river or stream running from one end to the other
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