I've read that Voya Nui took up a large part of the Southern Continent, and I'm not sure how accurate that is. It did not have many Matoran living on it, but I know that continent was sparsely populated anyway. But still, I think if it was that big the Matoran Karzahni sent there would have not been so isolated. Also, wouldn't the hole made by a large chunk of a continent have caused much more flooding than what the waterfall depicted? I think that would cause flooding to fill Karda Nui much sooner than in a thousand years, and maybe the rest of the Matoran Universe too. The rest of the continent at least would be dominated by a massive downpour hundreds of miles across. So is it really that big and was the Southern Continent and the dome-sky over it really that messed up, or was it a smaller region with a proportionally smaller disaster when it shot to the surface?