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An _ONSEN_ (温泉) is a Japanese hot spring and the bathing facilities and inns frequently situated around them. As a volcanically active country, Japan has thousands of onsens scattered throughout all of its major islands. Onsens were traditionally used as public bathing places and today play a central role in Japanese domestic tourism.

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. Baths may be either publicly run by a municipality or privately (内湯, _uchiyu_), often as part of a hotel, _ryokan _, or bed and breakfast (民宿, _minshuku_).

Onsens are a central feature of Japanese tourism, typically found in the countryside, but there are also a number of popular establishments found in major cities. They are a major tourist attraction drawing Japanese couples, families, or company groups who want to get away from the hectic life of the city to relax. Japanese often talk of the virtues of "naked communion" (裸の付き合い, _hadaka no tsukiai_) for breaking down barriers and getting to know people in the relaxed atmosphere of a _ryokan_ with an attached onsen. Japanese television channels often feature special programs about local onsens.

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. Indoor onsen at Ōfuka Onsen

Traditionally, onsens were located outdoors, although a large number of inns have now built indoor bathing facilities as well. Onsens by definition use naturally hot water from geothermally heated springs. Onsens are different from sentō , indoor public bath houses where the baths are filled with heated tap water.

The legal definition of an onsen includes the requirement that its water must contain at least one of 19 designated chemical elements, including such minerals as iron, sulfur, and metabolic acid, and have an average temperature of 25 °C (77 °F) or warmer at the point of release. Stratifications exist for waters of different temperatures. Major onsen resort hotels often feature a wide variety of themed spa baths and artificial waterfalls in the bathing area _utaseyu_ (打たせ湯).

Onsen water is believed to have healing powers derived from its mineral content. A particular onsen may feature several different baths, each with water of a different mineral composition. The outdoor bath tubs are often made from Japanese cypress , marble , or granite , while indoor tubs may be made from tile , acrylic glass , or stainless steel . Particular onsens may also promote the special mineral composition of their waters, together with the healing properties these may have. Other services, such as massages, may also be offered.

CONTENTS

* 1 Mixed bathing

* 2 Etiquette

* 2.1 Ensuring cleanliness * 2.2 Swimsuits * 2.3 Towels * 2.4 Noise * 2.5 Tattoos

* 3 Therapy * 4 Risks * 5 Selected onsen * 6 See also * 7 References * 8 Further reading * 9 External links

MIXED BATHING

Guidebook to Hakone from 1811

Traditionally, men and women bathed together at both onsens and sentōs, but gender separation has been enforced since the opening of Japan to the West during the Meiji Restoration . Mixed bathing (混浴, _kon'yoku_) persists at some special onsen in rural areas of Japan, which usually also provide the option of separate "women-only" baths or different hours for the two sexes. Men may cover their genitals with a small towel while out of the water, while women usually wrap their bodies in full-size towels. Children of either sex may be seen in both the men's and the women's baths. In some prefectures of Japan , including Tokyo, where nude mixed bathing is banned, people are required to wear swimsuits or yugi (湯着, _yugi_), which are specifically designed for bathing.

ETIQUETTE

Baskets

ENSURING CLEANLINESS

At an onsen, as at a sentō, all guests are expected to wash their bodies and rinse themselves thoroughly before entering the hot water. Bathing stations are equipped with stools, faucets, wooden buckets, and toiletries such as soap and shampoo; nearly all onsen also provide removable shower heads for bathing convenience. Entering the onsen while still dirty or with traces of soap on the body is socially unacceptable.

SWIMSUITS

Bathers are not normally allowed to wear swimsuits in the baths. However, some modern _onsen_ with a water park atmosphere require their guests to wear a swimming suit in their mixed baths.

TOWELS

Onsen guests generally bring a small towel with them to use as a wash cloth. The towel can also provide a modicum of modesty when walking between the washing area and the baths. Some onsen allow one to wear the towel into the baths, while others have posted signs prohibiting this, saying that it makes it harder to clean the bath. It is sometimes against the rules to immerse or dip towels in the onsen bath water, since this can be considered unclean. In this latter case, people normally set their towels off to the side of the water when enjoying the baths, or place their folded towels on top of their heads.

NOISE

Onsen vary from quiet to noisy; some play piped music and often feature gushing fountains . Bathers will engage in conversation in this relaxed situation. There are usually prohibitions against rowdiness in the washing and bathing areas. A small amount of excess energy and splashing around is usually tolerated from children, however. Shower cubicles

TATTOOS

By 2015, around half (56%) of onsen operators had banned bathers with tattoos from using their facilities. The original reason for the tattoo ban was to keep out _ Yakuza _ and members of other crime gangs who traditionally have elaborate full-body decoration.

However, tattoo-friendly onsen do exist. A 2015 study by the Japan National Tourism Organisation found that more than 30% of onsen operators at hotels and inns across the country will not turn someone with a tattoo away; another 13% said they would grant access to a tattooed guest under certain conditions, such as having the tattoo covered up.

With the increase in foreign customers due to growing tourism, some onsens that previously banned tattoos are loosening their rules to allow guests with small tattoos to enter, provided they cover their tattoos with a patch or sticking plaster.

THERAPY

The volcanic nature of Japan provides plenty of springs. When the onsen water contains distinctive minerals or chemicals, the onsen establishments typically display what type of water it is.

Some examples of types of onsen include:

* Sulphur onsen (硫黄泉, _iō-sen_) * Sodium chloride onsen (ナトリウム泉, _natoriumu-sen_) * Hydrogen carbonate onsen (炭酸泉, _tansan-sen_) * Iron onsen (鉄泉, _tetsu-sen_)

In Japan, onsen are said to have various medical effects. Japanese people believe that a good soak in proper onsen heals aches, pains and diseases, and visit onsen as part of the treatment for such ailments as arthralgia , chronic skin diseases, diabetes, constipation, menstrual disorders, and so on.

These medical benefits have given onsens a central role in balneotherapy which is called " Onsen Therapy" (温泉療法, _onsen-ryōhō_). Onsen Therapy is a comprehensive bathing treatment conducted to maintain health, normalize dysfunctions, and prevent illness.

RISKS

Although millions of Japanese bathe in onsens every year with few noticeable side effects, there are still potential side effects to onsen usage, such as high blood pressure or heart disease.

_ Legionella _ bacteria have been found in some onsens with poor sanitation. Revelations of poor sanitary practices at some onsens have led to improved regulation by hot-spring communities to maintain their reputation.

There have been reports of infectious disease found in hot bodies of water worldwide, such as:

* Various _ Naegleria _ species. While studies have found the presence of Naegleria in hot spring waters, the worrisome _Naegleria fowleri _ amoeba has not been identified. Nevertheless, less than five cases have been seen historically in Japan, although not conclusively linked to onsen exposure.

Many onsens display notices reminding anyone with open cuts, sores, or lesions not to bathe. Additionally, in recent years onsens are increasingly adding chlorine to their waters to prevent infection, although many onsen purists seek natural, unchlorinated onsens that do not recycle their water but instead clean the baths daily. These precautions as well as proper onsen usage (i.e. not placing the head underwater, washing thoroughly before entering the bath) greatly reduce any overall risk to bathers.

SELECTED ONSEN

_ Old Tsuru-no-yu Bathhouse in Nyūtō Onsen area, Akita Winter bathing at Tsuru-no-yu rotten-buro in Nyūtō, Akita Kurokawa Onsen roten-buro in Kyushu Japanese macaques enjoying a roten-buro_ open-air onsen at Jigokudani Monkey Park Yumura-onsen's hot-spring resort and forests in Shin\'onsen, Hyōgo Dōgo Onsen hot springs (main building) in Matsuyama, Ehime Ginzan Onsen in Obanazawa, Yamagata

* Akagi, Gunma * Akayu, Yamagata * Arima Onsen , Kobe , Hyōgo * Asamushi Onsen , Aomori Prefecture * Aso, Kumamoto , a famous onsen area alongside Mount Aso , an active volcano * Atami Onsen (ja), Atami , Shizuoka, major onsen resort town near Tokyo * Awara Onsen (ja), Awara, Fukui Prefecture * Awazu Onsen (ja), Komatsu, Ishikawa * Beppu Onsen , Beppu , Ōita Prefecture, famous for its multi-coloured baths * Dake Onsen (ja), Nihonmatsu, Fukushima * Dōgo Onsen , Ehime Prefecture * Futamata , Hokkaidō * Gero Onsen (ja), Gero, Gifu , famous for its free open bath on riverbank of Hida River * Getō Onsen (ja), Iwate Prefecture * Ginzan Onsen , Obanazawa, Yamagata * Hakone , Kanagawa , famous onsen resort town near Tokyo * Hanamaki, Iwate * Hirayu Onsen (ja), Takayama, Gifu * Hokkawa Onsen (ja), Shizuoka * Ibusuki Onsen , Kagoshima Prefecture * Iizaka Onsen (ja), Fukushima * Ikaho Onsen (ja), Ikaho , Gunma * Itō, Shizuoka * Iwaki Yumoto Onsen , Fukushima Prefecture * Iwamuro, Niigata , famous for onsen since the Edo period * Jigokudani , Nagano Prefecture * Jōzankei Onsen (ja), Hokkaido * Kaike Onsen (ja), Yonago , Tottori * Kakeyu Onsen (ja), Nagano * Kanzanji Onsen (ja), Shizuoka * Katayamazu Onsen (ja), Kaga, Ishikawa * Kawayu Onsen (ja), Tanabe, Wakayama * Kindaichi Onsen , Iwate * Kinosaki, Hyōgo * Kinugawa Onsen , Tochigi * Kurokawa Onsen , Aso , Kumamoto Prefecture * Kusatsu Onsen , Gunma Prefecture * Misasa Onsen (ja), Misasa , Tottori Prefecture * Nagaragawa Onsen , Gifu, Gifu * Nanki-Katsuura Onsen (ja), Nachikatsuura, Wakayama * Nanki-Shirahama Onsen , Shirahama , Wakayama Prefecture * Naoshima , Kagawa Prefecture * Naruko , Miyagi * Noboribetsu , Hokkaido * Nuruyu Onsen , Kumamoto Prefecture * Nyūtō Onsen (ja), Akita Prefecture * Onneyu Onsen (ja), Hokkaido * Ōfuka Onsen , Akita * Ryujin Onsen , Tanabe, Wakayama , one of Japan's famous three beautifying onsen * Sabakoyu Onsen , Fukushima Prefecture , the oldest community onsen in Japan * Sakunami Onsen , Miyagi * Sawatari , Gunma Prefecture * Senami Onsen (ja), Niigata Prefecture * Shima Onsen , Gunma Prefecture * Shimabara, Nagasaki * Shimobe Onsen (ja), Yamanashi Prefecture * Shiobara Onsen (ja), Tochigi Prefecture * Shuzenji Onsen (ja), Shizuoka Prefecture * Sōunkyo Onsen (ja), Hokkaido * Sukayu Onsen , Aomori Prefecture * Sumatakyō Onsen (ja), Shizuoka Prefecture * Suwa , Nagano Prefecture * Takanoyu Onsen , Akita Prefecture * Takaragawa , Gunma, one of the largest outdoor mixed baths in Japan * Takarazuka, Hyōgo * Tara, Saga * Tōyako, Hokkaidō * Tsubame Onsen (ja), Niigata - famous for its free open mixed onsen * Tsuchiyu Onsen , Fukushima Prefecture * Tsukioka Onsen, Niigata (ja), Niigata Prefecture * Tsurumaki Onsen (ja), Kanagawa * Unazuki Onsen (ja), Kurobe, Toyama Prefecture * Wakura Onsen , Nanao, Ishikawa Prefecture * Yamanaka Onsen , Kaga, Ishikawa * Yamashiro Onsen (ja), Kaga, Ishikawa * Yubara Onsen (]), Okayama Prefecture , one of the largest mixed baths at the foot of Yubara dam

* Yudanaka Onsen (ja), Nagano Prefecture * Yufuin , Ōita Prefecture * Yugawara , Kanagawa Prefecture * Yumura Onsen (ja), (Shin\'onsen, Hyōgo ) * Yunogo Onsen , Okayama Prefecture * Yunokawa Onsen , Hokkaido * Yunomine Onsen (ja), Tanabe, Wakayama , site of the UNESCO World Heritage Tsuboyu bath * Yuzawa, Niigata * Zaō Onsen , Yamagata Prefecture

SEE ALSO

* Ashiyu * Balneotherapy * Furo * Public bathing * Sauna * Sentō * Taiwanese hot springs * Three Ancient Springs * Turkish bath

REFERENCES

* ^ This term should be carefully differentiated from the word skinship (スキンシップ, _sukinshippu_) which refers to the benefits of physical contact, for instance, on babies by their mothers. * ^ "Japan\'s Konyoku (mixed gender) Onsen Best 100". Konyoku.org. Retrieved January 11, 2014. * ^ In very isolated onsen, where there is no possibility to use soap before entering in the bath, onsen users are expected to at least rinse their body with the water of the bath before entering it. * ^ _A_ _B_ _C_ Ryall, Julian (6 November 2015). "Japanese owners of famous ‘onsen’ hot springs soften their stance on tattoo ban to appease foreign visitors". Archived from the original on 17 January 2016. * ^ Thompson, Ashley (6 November 2012). "If you need to bring drugs to Japan, sort out the paperwork — or else". _The Japan Times_. Archived from the original on 19 July 2015. * ^ Xeni Jardin (22 December 2009). " Tattoo in Japan". Boing Boing. Archived from the original on 24 December 2009. * ^ _ Onsen Warnings and Hassles_, archived from the original on 24 January 2016 * ^ Thompson, Ashley (27 November 2012). "Ink doesn’t always cause a stink at the onsen". _The Japan Times_. Archived from the original on 19 July 2015. * ^ Lund, Evie (17 April 2015). " Onsen in Nagano will now welcome foreigners with tattoos, as long as they patch ’em up". Archived from the original on 14 December 2015. * ^ Serbulea, Mihaela; Payyappallimana, Unnikrishnan. " Onsen (hot springs) in Japan—Transforming terrain into healing landscapes". _ ScienceDirect _. doi :10.1016/j.healthplace.2012.06.020 . * ^ _A_ _B_ _C_ Getting into hot water for health. The Japan Times. May 25, 2003. * ^ "Hot Spring Treatment|Hot Spring Encyclopedia|ONSEN|BEPPU CITY|". City.beppu.oita.jp. Retrieved 2010-12-07. * ^ H. Miyamoto; S. Jitsurong; R. Shiota; K. Maruta; S. Yoshida; E. Yabuuchi (1997). "Molecular determination of infection source of a sporadic Legionella pneumonia case associated with a hot spring bath". _Microbiol Immunol_. 41 (3): 197–202. PMID 9130230 . doi :10.1111/j.1348-0421.1997.tb01190.x . * ^ Eiko Yabuuchi Kunio Agata (2004). "An outbreak of legionellosis in a new facility of hot spring Bath in Hiuga City". _Kansenshogaku Zasshi_. 78 (2): 90–98. ISSN 0387-5911 . PMID 15103899 . CS1 maint: Uses authors parameter (link ) * ^ _A_ _B_ "Onsen: know what you\'re getting into". _The Japan Times_. * ^ _A_ _B_ Shinji Izumiyama; Kenji Yagita; Reiko Furushima-Shimogawara; Tokiko Asakura; Tatsuya Karasudani; Takuro Endō (July 2003). "Occurrence and Distribution of