Fall-line definitions

The steepest possible line of descent from a given point on a slope.
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A line connecting the waterfalls of upland rivers before they reach a common coastal plain, often marking the limit of upstream navigation and indicating a zone of potential water power for industrial purposes.
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The geographical line indicating the beginning of a plateau, usually marked by many waterfalls and rapids.
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The line of direct descent down a hill.
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The line east of the Appalachian Mountains, marking the end of the coastal plains and the beginning of the Piedmont Plateau.
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A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
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(geomorphology) A geomorphologic unconformity marking a boundary between an upland region and a plane; sometimes marked by a series of waterfalls on rivers that cross it.
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(snowboarding) The imaginary line downhill that something falling downhill would naturally follow.
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