Hokkaido is the second largest island of Japan. Situated in the far north, it's a vast and relatively untouched wilderness approximately 40 times bigger than Tokyo but with only a third of the population. If you're planning to visit this enchanting region then be sure to check out the Blue Pond (Aoiike), named so because of the natural minerals that turn the water into a beautiful blue lagoon. You can find it on the outskirts of Shirogane Onsen, a hot spring town in Kamikawa District.