I am still working on the new Ateph, and it is not going as planned.
While inspecting my latest regeneration of my test Ateph I see this square structure in the distance. Now I know that only I and the creepers are on the server, and I did not build that square.
If you take a look at this screen capture you will see lots of grass, that should be snow/ice. In the middle of that obsidian and water square is a ocean monument, I guess that is what you get when place a Deep Ocean biome in our Ateph.