an imaginary line, marked by waterfalls and rapids, where rivers descend abruptly from an upland to a lowland.
(initial capital letters) Eastern U.S. the imaginary line between the Piedmont and the Atlantic coastal plain.
Skiing. the path of natural descent from one point on a slope to another.
(skiing) the natural downward course between two points on a slope
the edge of a plateau
a natural junction, running parallel to the E coast of the US, between the hard rocks of the Appalachians and the softer coastal plain, along which rivers form falls and rapids
fall line
A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.


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