Aogashima is a volcanic Japanese island in the Philippine Sea, located 222 mi south of Tokyo.
The island’s area is 3.38 sq mi and, as of 2014, its population is 170.
The island has several hot springs due to the geothermal energy of the volcano. According to one tourist, who wrote about a visit to one of the island’s natural saunas, you can bring food and cook it by placing it on top of one of the sauna’s steam vents. The sauna has a collection of pots and pans at the ready for boiling eggs and other snacks.