I do believe that the answer is Finland.
Well there are many different answers to this question and I am not sure what the answers is.
3.Sea level
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The biggest doubling time of all the regions/continents in the world has Europe.
Europe is the only continent that has almost 0% population growth (as of 2014), which practically means that with this pace Europe will need an eternity to be able to double its population, so it makes it the continent with the biggest time needed to double it's population.
