Create New World
==> Custmized World
==> Biomes : set to Deep Ocean;Sea Level : set to 1;No Caves;No Ravines;
==> When i appear, i spawn on a PLAIN isle biome and arround there is chunks whiches aren't in the same height. There is also in this bugged chunks ravines and caves whereas i had not notched it.

Download the map to test http://www.mediafire.com/download/3k15nrqucskxoiq/world.zip