Japan is known for its numerous—and excellent—hot springs, but not everyone has the time or money to make it to some of the country's most scenic outdoor tubs. However, you don't have to venture far too enjoy a soak in naturally heated waters. Just indulge in one of Tokyo's sento. Some of the best are located in the Ota City, and the new website Ota1010 can steer you to the perfect bath house.

What is a Sento?

Sento are Japan's public bathhouses, designed to cater to those who didn't have bathtubs in their own homes, a luxury that wasn't commonplace until some time after the end of World War II. Sento were first seen in Buddhist temples, as places were monks could bathe communally. The baths were later opened to the public, and by the end of the 12th century, sento had grown beyond the confines of the temple grounds and were often run as private businesses.

Sento were often viewed by individual neighborhoods and towns not just as places to come and clean oneself, but as centers of social interaction. Members of all generations could come together to chat, bathe and strengthen community ties.

While most Japanese now bathe in their own homes, the sento is seeking to reinvent itself. Some sento are drawing crowds for their once-again popular art deco interiors, while others incorporate high-end spa features. No matter the atmosphere, a soak in an Ota City sento is an experience to be savored.

How to Visit a Sento

Ota City's sento have recently begun opening their doors to foreigners, encouraging international visitors to enjoy the waters and providing multilingual explanations to improve the experience. However, visitors with a basic understanding of Japanese bathing etiquette before they go will find their outing to be even more enjoyable. The Ota1010 website provides a handy guide of what to do, complete with accompanying illustrations.

When heading to a public bath house, remember the following basic steps:

1. Remove your shoes at the door

Like most Japanese homes, shoes are never worn in the bath house. There will always be a rack, lockers or a place by the door to leave your footwear.

2. Pay your fee and purchase any products

A main desk near the entrance collects the admission fee, and also usually stocks bath products, towels and occasionally beauty items. Some bath houses have rentable towels, while others require you to purchase towels outright. You are also more than welcome to bring your own towels.

3. Enter the appropriate side

Sento are split by gender, with men and women occupying opposite sides of the bath house. The individual entrances are marked with colored curtains - men are often represented by blue, while a red curtain is used most frequently for women. When in doubt, ask the staff at the front.

4. Undress and store your belongings

Once you enter the appropriate bath, you'll find yourself in a large changing area. Some sento provide large lockers (occasionally requiring 100 coins that will be reimbursed after use) while others merely offer wicker or plastic baskets in which to place your clothes and other belongings. Undress and remove ALL of your clothing (yes, everything) before heading to the bath area. Also leave your large bath towel (if you have one) with your clothes, but take your small "modesty" towel with you.

5. Rinse off BEFORE entering the bath

Unlike many Western cultures, the bath itself is not used for washing. Rather, bathers are required to rinse themselves off at a shower area before entering the main tubs themselves. Shampoo and body soap are often provided for visitors' use and bathers are expected to rinse any soap suds thoroughly from their body before making their way into the tubs for a soak. Not sure what to do with that tiny modesty towel? Don't let it drop into the bath but do feel free to either place it on the tub's rim (if there's room or it's not too wet) or fold it up and place it on top of your head.

6. Towel off BEFORE re-entering the changing room

Once you've enjoyed a nice long soak, take that hopefully still-dry modesty towel and give your body a quick wipe before heading back to your individual changing area. No one wants to pick their way across a slippery changing room floor.

7. Cool down with a refreshing drink

Hot baths can be dehydrating so it's always a good idea to drink some water after your soak. Water is often available in the changing room or in a vending machine in the lobby. Nearly all sento also offer milk, a popular post-bath beverage that many Japanese swear by after a dip in a hot spring.

Why Bathe in Ota City?

Ota City is known for their abundance of kuroyu, or black baths. These unique hot springs earned the name of black baths due to the microscopic flecks of decaying plant matter that have been dissolved in the hot waters during geothermal activity. The result is a smooth or silky-feeling bath that many bathers claim has a positive effect on the skin.

Ota City also has a range of other hot springs, including chloride springs (which contain high levels of salt) and hydrogen carbonate springs (which have the same benefits as a baking soda bath). Add to that the option of jet baths, cold water baths and carbonated springs and you'll be spoiled for choice in this part of Tokyo. You can easily find bath houses that meet your preferences by using the handy search function on the Ota1010 website.

Where to Bathe in Ota City

Ota City has dozens of sento, many of which utilize natural hot springs sourced from the bottom of the nearby Tokyo Bay. A map of bath houses, along with a description and photos of each location, is provided on the Ota1010 website.

Why not make a visit to a sento the first or last thing you do in Japan? Many of Ota City's sento are located just a few short train stops from Haneda Airport. You can soak in style in the relaxing waters before heading off to board your return flight.