ridgiest

/ˈrɪdʒiɪst/
adjective
  1. Superlative form of ridgy; having the most ridges or the most pronounced ridged surface.
    • Of all the trails, the ridgiest one led up the steepest mountain.
    • The ridgiest part of the roof collects the most snow.
    • Her fingerprints are the ridgiest I've ever seen, making them very distinct.