Hasn't Persian Gulf been renamed Arabian Gulf? At least, that's the term I hear being used on intl. politics scene. I know that Arabian countries have been using Arabian Gulf since the 60's, but have noticed that more and more countries are presently sharing their view, e.g. US, EU.
There's an argument between Saudi Arabis and Iran over the name. So technically, both are used, though I've only heard it refered to as the Persian Gulf.
17/20 Could've gotten one more if I could spell prairie. Also, I agree with what some other people have said that prairie is a bad classification of the great plains.
Polynesia does not cover the area it should. Hawaii and Easter Island should be within the area; you have the correct shape, but it's not big enough to cover everything it should.