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Fall line

/ˈfôl ˌlīn/

noun
- 1. the route leading straight down any particular part of a slope: "study the fall line and plan your turns"
- 2. a narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of falls and rapids where rivers and streams cross it.
- ▪ (in the US) the zone demarcating the Piedmont from the Atlantic coastal plain.
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Fall line
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Geomorphologic break that demarcates the border between an upland region and a coastal plain
A fall line (or fall zone) is the area where an upland region and a coastal plain meet and is noticeable especially where rivers cross it, with resulting rapids or waterfalls. The uplands are relatively hard crystalline basement rock, and the coastal plain is softer sedimentary rock. A fall line often will recede upstream as a river cuts out the uphill dense material, forming "c"-shaped waterfalls... Wikipedia
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