It's a small real life track on Japan's northern island of Hokkaido. More info in the Readme and in the description in the download section.
http://postimg.com/34000/photo-33607.jpg
GTR2 version and possibly those for other sims like Race07 and GT Legends to follow (if I can find people with those sims who can beta test it for me..)
Regards, Rudy
Alternate download link is here btw:
http://www.mediafire.com/?p8y5124o82f984v