Interlocking spurs

In an upland valley, ridges of land can project from alternate sides, rather like fingers reaching towards one another. These are interlocking spurs. The river winds between them along a narrow valley floor, much of which may be occupied by the channel.

Because erosion is mainly downwards, with relatively little sideways erosion, the ridges remain prominent. These ridges are interlocking spurs.

Interlocking spurs are projecting ridges of valley-side land that alternate from opposite sides of a narrow valley. Viewed from above, they appear to fit between one another rather than forming a straight, open valley floor.