trying to remember a movie involving an island, needing the titile!!!!

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I can barely remember anything of this movie, its vagelyabout a load of convicted criminals being put on an island (probaly becouse prison was to overcroweded. I think two sides devlop and start tofight?? cant remember, also it may of had someone like vinnie jones in. And I can always remember one scene were two friends (probably the main carahter) fighting to the death in a lake or somthing... please help!



Is it a really good movie?