ridges

noun

1. The back of any animal; especially the upper or projecting part of the back of a quadruped.
2. Any extended protuberance; a projecting line or strip.“The plough threw up ridges of earth between the furrows.”
3. The line along which two sloping surfaces meet which diverge towards the ground.
4. The highest point on a roof, represented by a horizontal line where two roof areas intersect, running the length of the area.