A video showcasing the stool and shower used for cleaning off, an inside pool and an outside pool.
An onsen () is a Japanese hot spring; the term also extends to cover the bathing facilities and traditional inns frequently situated around a hot spring. As a volcanically active country, Japan has thousands of onsens scattered throughout all of its major islands.
Onsens come in many types and shapes, including outdoor (? or ?, roten-buro or noten-buro) and indoor baths (, uchiyu). Baths may be either publicly run by a municipality or privately, often as part of a hotel, ryokan, or bed and breakfast (, minshuku).
The presence of an onsen is often indicated on signs and maps by the symbol ? or the kanji? (yu, meaning "hot water"). Sometimes the simpler hiragana character ? (yu), understandable to younger children, is used.
Traditionally, onsens were located outdoors, although many inns have now built indoor bathing facilities as well. Nowadays, as most households have their own bath, the number of traditional public baths has decreased, but the number of sightseeing hot spring towns has increased (most notable ones including Kinosaki Onsen, Togura Kamiyamada Onsen [ja], and Akanko Onsen [ja]). Onsens by definition use naturally hot water from geothermally heated springs. Onsens are different from sent?, indoor public bath houses where the baths are filled with heated tap water.
Traditionally, men and women bathed together at both onsens and sent?s, but gender separation has been enforced since the opening of Japan to the West during the Meiji Restoration. The practice had contributed at the time to Western ideas of the Japanese as an inferior race. Mixed bathing (, 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 (, yugi), or yuami-gi, which are specifically designed for bathing.
As at a sent?, at an onsen all guests are expected to wash 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.[a]
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.
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 against the rules to immerse or dip towels in the onsen bath water, since this can be considered unclean. 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.
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; However a small amount of excess energy and splashing around is usually tolerated from children.
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. Some towns have many tattoo-friendly onsens that do not require guests to cover them up. Two such towns are Kinosaki Onsen in Hy?go and Beppu Onsen in ?ita.
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.
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 (, i?-sen)
Sodium chloride onsen (, natoriumu-sen)
Hydrogen carbonate onsen (, tansan-sen)
Iron onsen (, tetsu-sen)
Ordinary onsen (, tanzyun-sen)
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 aggravating 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, fewer 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.
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Old Tsuru-no-yu Bathhouse in Ny?t? Onsen area, Akita
Winter bathing at Tsuru-no-yu roten-buro in Ny?t?, Akita
^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. doi:10.1111/j.1348-0421.1997.tb01190.x. PMID9130230.
^ abShinji Izumiyama; Kenji Yagita; Reiko Furushima-Shimogawara; Tokiko Asakura; Tatsuya Karasudani; Takuro End? (July 2003). "Occurrence and Distribution of Naegleria Species in Thermal Waters in Japan". The Journal of Eukaryotic Microbiology. 50 (s1): 514-5. doi:10.1111/j.1550-7408.2003.tb00614.x. PMID14736147.
^Yasuo Sugita; Teruhiko Fujii; Itsurou Hayashi; Takachika Aoki; Toshir? Yokoyama; Minoru Morimatsu; Toshihide Fukuma; Yoshiaki Takamiya (May 1999). "Primary amebic meningoencephalitis due to Naegleria fowleri: An autopsy case in Japan". Pathology International. 49 (5): 468-70. doi:10.1046/j.1440-1827.1999.00893.x. PMID10417693.
Hotta, Anne, and Yoko Ishiguro. A Guide to Japanese Hot Springs. New York: Kodansha America, 1986. ISBN0-87011-720-3.
Neff, Robert. Japan's Hidden Hot Springs. Rutland, Vermont: Charles E. Tuttle, 1995. ISBN0-8048-1949-1.
Seki, Akihiko, and Elizabeth Heilman Brooke. The Japanese Spa: A Guide to Japan's Finest Ryokan and Onsen. Boston: Tuttle Publishing, 2005. ISBN0-8048-3671-X. Reprinted as Ryokan: Japan's Finest Spas and Inns, 2007. ISBN0-8048-3839-9.