Fall line (topography)

A fall line refers to the line down a mountain or hill which is most directly downhill; that is, the direction a ball or other body would accelerate if it were free to move on the slope under gravity.

In mountain biking, a trail follows the "fall line" if it generally descends in the most downward direction, rather than traversing in a sideways direction.

[1] A skier is said to be "skiing the fall line" if they are moving generally down, making turns either side of the fall line, rather than moving across the slope.

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Contour map with an example fall line. Contour lines of constant elevation are blue. One example fall line is red.
A mountain biker riding a trail which follows the fall line.