An onsen is a term for hot springs in the Japanese language, though the term is often used to describe the bathing facilities and inns around the hot springs. As a volcanically active country, Japan has thousands of onsen scattered along its length and breadth. Onsen were traditionally used as public bathing places and today play a central role in directing Japanese domestic tourism.
Onsen come in many types and shapes, including outdoor and indoor baths. Baths may be either public run by a municipality or private often run as part of a hotel, ryokan or bed and breakfast.