Is a term for hot springs in the Japanese language. As a volcanically active country, Japan has thousands of onsen scattered along its length and breadth. Onsen come in many types and shapes, including outdoor (露天風呂 or 野天風呂, roten-buro or noten-buro?) and indoor baths.
Onsen water is believed to have healing powers derived from its mineral content. A particular onsen may feature several different baths, each with water with a different mineral composition. The outdoor bath tubs are most often made from Japanese cypress, marble or granite, while indoor tubs may be made with tile, acrylic glass or stainless steel. Different onsen also boast about their different waters or mineral compositions, plus what healing properties these may contain.