Japan is a group of islands that comprises part of the "Ring of Fire", i.e. lands with active volcanoes surrounding the Pacific Ocean, and heat under the earth's crust has created countless hot springs (in Japanese, "onsen") throughout the nation. Japan has had traditions going back hundreds of years using these hot springs and hot baths for relaxation and health. This category is for sites on Japanese hot springs, including listings, reviews, access, and resorts related to them.