In by Jackie Dunn

The horizontal line at the junction of the top edges of two sloping roof surfaces.

Merriam-Webster Online Dictionary
ridge (noun)
an elevated body part or structure
a) a range of hills or mountains
b) an elongate elevation on an ocean bottom
an elongate crest or a linear series of crests
a raised strip (as of plowed ground)
the line of intersection at the top between the opposite slopes or sides of a roof
ridge (verb)
transitive verb
intransitive verb
to form into a ridge to extend in - ridges
ridge (Wikipedia)
A mountain ridge in Japan
A stratigraphic ridge within the Appalachian Mountains.
The edges of tuyas can form ridges.

A ridge or a mountain ridge is a geological feature consisting of a chain of mountains or hills that form a continuous elevated crest for some distance. The sides of the ridge slope away from narrow top on either side.The line along the crest formed by the highest points, with the terrain dropping down on either side, is called the ridgeline. Ridges are usually termed hills or mountains as well, depending on size.

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