Pokapoka Land Miasa, located next to a roadside station in Omachi City, Nagano Prefecture, is a facility where you can stay overnight or enjoy day-use bathing. Its biggest attraction is the hot spring using the rare Hokutolite, a mineral produced in only a few places worldwide such as Tamagawa Onsen in Akita. The facility also features a retractable-stove Bona Sauna and a single-person jar-style cold plunge bath fed by groundwater, earning high praise from sauna enthusiasts.