Cliffs would be a landform you could find on islands like the mountains, where it would be a very steep drop that you couldn't just move up with most nichelings. However, if you can fly or have a rock climbing ability, then you could. Rock climbing would also let you use rocks as tree stumps. If caves are added, they would generate frequently near cliffs. When within three tiles of water, you will sometimes find sea bird nests. Genes Ibex Hindlegs (probably called something else)