Australia, New Zealand, and Japan have many very good beers (Little creatures, Emerson's, Hitachino). They also have some very bad beers (DB Gold, Fosters, VB, Lion Red).
As for South America you have Eisenbahn from Brazil and from Africa you have Tusker. From South America and Africa the market is mostly larger breweries (South African Brewers and Imbev). Some good lagers but nothing mind blowing.
A friend of mine lived at the research center in Antarctica and did some home brew but I am not sure that would be in the top 25.