I believe it's around the Pacific Ocean.
The man who proposed the cycle of erosion is William Morris Davis
I'm a bit confused on what's happening here. But if you want to fill me in message me plz :)
I'd have to say the Southern Eurasian plate and the Western part of "our" North American plate (mainly around California) both have a lot of above sea level activity. The most activity below or right at sea level would possibly be the Philippines plate.
