An ocean biome chunk cutting into land in other biomes causing them to look like this. This is a freshly created 1.4.2 world.
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duplicates 1
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This is in fact a new world that i generated from The Halloween update. I did not run it on any other versions
Duplicate of MC-315.
Chunk error, by exploring old and new terrain or by creating a new world with the same name as an old world.