Differences between Onsen, Sento and Rotenburo in Japan

Japan is famous for its public baths, places of relaxation and purification that are an integral part of Japanese culture. Three main types of baths are distinguished: onsen, sento and rotenburo. Each offers a unique experience and it is important to understand their differences and the general rules to fully enjoy them.

Onsen : Natural Hot Spring Baths

Onsen are baths of natural hot springs, rich in minerals beneficial to health. Their water comes from geothermal sources and they must contain a certain concentration of minerals to be classified as such. Onsen are often located in mountainous or volcanic areas, where geothermal activity is high.

Characteristics of onsen:

• Mineral waterContains elements such as sulphur, iron, calcium and magnesium.
• Health benefits: Sooth muscle pain, improve blood circulation and relax muscles.
• Natural setting: Often located in beautiful natural environments, offering stunning views of mountains or forests.

Onsen can be found inryokan(traditional inn), luxury hotels or public baths. Some onsen are outdoors, offering an even more immersive experience with the surrounding nature.

Konyoku:

Thekonyoku onsenare mixed thermal baths in Japan, where men and women bath together. Historically widespread, they have become rare today. Some accept tattoos, attracting travelers looking for authentic experiences. Wearing a special towel is sometimes allowed for more discretion.

Higaeri onsen

Thehigaeri onsenare thermal baths accessible without accommodation, perfect for a relaxing break during the day. Located in the city or in the middle of nature, they offer an authentic experience for travelers in a hurry. Some accept tattoos, allowing for unimpeded immersion in Japanese hot spring culture.

Sento : Urban Public Baths

Senso, on the other hand, are public baths that do not depend on natural hot springs. They are located mainly in urban areas and use heated water at the ideal temperature for swimming. Historically, the scents served those who did not have a bathroom at home.

Senso characteristics:

• Heated waterWater is artificially heated, often at a temperature around 40°C.
• AccessibilityLocated in residential areas, they are easily accessible to all.
• Community: Place of socialization for the inhabitants, fostering social interactions.

Senso often have several types of baths, such as hot tubs, cold baths and even baths with water jets for massage. Some modern sento integrate traditional elements with modern facilities to attract a wider clientele.

Rotenburo : Outdoor Baths

The rotenburo are outdoor baths, and they can be either onsen or sento. What distinguishes them is their outdoor location, allowing bathers to enjoy the surrounding nature while relaxing in warm water.

Characteristics of the rotenburo :

• Outdoor environment: Often located in picturesque places, offering views of gardens, mountains or rivers.
• Immersive experience: Combination of fresh air and hot water for maximum relaxation.
• Variety: Can be found in onsen or senso, offering the benefits of either.

Rotenburo are particularly appreciated in winter, when the contrast between hot and fresh air creates a unique and invigorating experience.

Find an onsen

General rules to follow in Japanese Baths

Whether you are visiting an onsen, a senso or a rotenburo, there are rules of courtesy and hygiene to ensure a pleasant experience for all bathers:

1. Shower before bath: It is imperative to wash carefully before entering the bath. Shower areas are generally equipped with seats, hand showers, soap and shampoo.
2. No clothes in the bath: Baths are usually taken naked. Only a small towel is allowed to cover outside the bath, but it must not enter the water.
3. Hair tied: If you have long hair, tie them to prevent them from touching the bath water.
4. Silence and respect: Baths are places of relaxation and meditation. Speak in a low voice and respect the calm.
5. No tattoos: In some onsen and sento, tattoos can be banned because of their traditional association with gangs. If you have tattoos, check the institution’s policies or use tabs. (Here, a site listing onsens accepting them)
6. Avoid diving: Enter and get out of the bath gently so as not to splash the other bathers.
7. HydrationAfter the bath, moisturize well because the heat can cause dehydration.

Japan offers a multitude of bath experiences, each with its own features and charms. Whether you opt for the therapeutic relaxation of onsen, the conviviality of urban sento or the natural beauty of rotenburo, you will discover a unique facet of Japanese culture. By following the rules of courtesy and hygiene, you will make sure to live a pleasant and respectful experience, while enjoying the benefits of these traditional baths. Prepare to dive into the art of Japanese swimming and to come out revitalized and soothed.

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