"In Japan, onsen (温泉) are the country´s hot springs and the bathing facilities and traditional inns around them. As a volcanically active country, Japan has thousands ...
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of onsens scattered throughout all of its major islands.
Onsens 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 (内湯, uchiyu). Baths may be either publicly run by a municipality or privately, often as part of a hotel, ryokan, or bed and breakfast (民宿, minshuku).
The presence of an onsen is often indicated on signs and maps by the symbol ♨ or the kanji 湯 (yu, meaning "hot water"). Sometimes the simpler hiragana character ゆ (yu), understandable to younger children, is used." - (en.wikipedia.org 30.03.2021)