Definition from Wiktionary, the free dictionary
ridgeline (plural ridgelines)
- The topmost edge along a mountain ridge.
- To either side there are beautiful views from the trail along the ridgeline.
- Federal Aviation Administration, Rotorcraft Flying Handbook, ISBN 1602390606, Skyhorse Publishing, 2007, p. 10-8 
- A ridgeline is a long area from which the surface drops away steeply on one or two sides, such as a bluff or precipice.
- Stewart M. Green, Rock Climbing Arizona, ISBN 156044813X, Globe Pequot, 1999, p. 77 
- As the trail flattens out, it follows the draw up right to a saddle in the ridgeline.
- John R. Nolon, Open Ground: Effective Local Strategies for Protecting Natural Resources, ISBN 1585760552, Environmental Law Institute, 2003, p. 29 
- Surface runoff from ridgeline development can contaminate rivers and streams that supply drinking water downstream.
- Zoning regulations of the Town of Clinton, New York, §2.5, cited in 
- These ridgelines and hilltops are exceptional aesthetic and ecological resources, visible from many perspectives and distances.
- Margaret Weis, Master of Dragons, ISBN 0765304708, Macmillan, 2005, ch. 34 
- Standing atop the ridgeline, King Edward watched the nightmare scenario he himself had predicted.