1. USA (host of the UFC and Strike-force)
2. Brazil (home of many great MMA fighters like Spider Silva and Royce Gracie)
3. Japan ( the birthplace of MMA. home of PRIDE and Dream. Fighters like Takanori Gomi)
4. England (home of michael bisbing and dan hardy)
5. Canada (you have to include Canada because of GSP)
Not included: Russia, Cameroon (Soukoudjou,) Mexico.