Originally Posted by gap

This is my first attempt at modding the SHIII terrain. It should add the Île de Sein to the game:

https://www.mediafire.com/?vq414s3rvs09i4l

It is based on GWX Gold terrain, but the files it modifies are probably identical in stock game and in other mega mods. Enable it with SH3 repacker and let me know if it works