<Li> Longitudinal valley: An elongated valley found between two almost parallel mountain chains . </Li> <P> Similar geological structures, such as canyons, ravines, gorges, gullies, chines and kloofs, are not usually referred to as valleys . </P> <P> A valley formed by flowing water, or river valley, is usually V - shaped . The exact shape will depend on the characteristics of the stream flowing through it . Rivers with steep gradients, as in mountain ranges, produce steep walls and a bottom . Shallower slopes may produce broader and gentler valleys . However, in the lowest stretch of a river, where it approaches its base level, it begins to deposit sediment and the valley bottom becomes a floodplain . </P> <P> Some broad V examples are: </P>

Most common type of valley in the world