Games : How to create a large ocean area using Bukkit?

I use a Bukkit server for a personal Minecraft project, so I can use mods like WorldEdit, and have further configuration options than regular minecraft.

Recently, through using the MCEdit application, I preformed a "Prune" opperation on the map that I've been working on, to remove all of the excess areas on my map that I would never utilize. I essentially wanted to replace all of these areas with water, and after "Pruning" off the rest of the map, I was going to put the map back into my server and use WorldEdit to make this massive area of water.

When I put the map into my server, I was hoping that once i loaded the server up, it would only load the few select chunks that I had not deleted, but unfortunately, Bukkit spawned new chunks around the area I had saved.

Is there any way to prevent this from happening, or otherwise create a large water area? To be clear, any trick to making a water-world will work, it doesn't have to involve preventing chunks from being generated.

I've tried a few mods, but none of them work because the Bukkit server automatically spawns into empty chunk spaces before it loads the plugins that would prevent this from happening.