Ignore the bad pic, my computer lost the F2 key so I needed to use my iPad.
As you can see, there is a very flat, awkward descent of terrain. It is perfectly along the chunk border where the Lindon Coast biome meets the Sea biome. There are other cases to where there is a Sea biome surrounded by Lindon Coast, and it basically just creates a mountain with a chunk-sized hole in the middle. I couldn’t find examples of this for this report, though.
So essentially, everywhere the Sea meets the Lindon Coast biome, those awful sheer cliffs appear. This isn’t an error in chunk generation, as I regenerated the chunks multiple times in both the world files and WorldEdit. Perhaps an issue with biomes?
Doesn't look too bad to me. I'd say it's just naturally generated cliff terrain. With everything generating randomly, you're bound to find some things that look a little weird from time to time (case in point: flying islands).