Tawarayama Onsen is a quiet spa district in Yamaguchi Prefecture with a thousand-year history and famous enough to being visited by daimyo (feudal lords) themselves during the Edo Period (1603-1867). It has several water sources considered particularly therapeutic, partly because they are rich in hydrogen, and therefore have a strong antioxidant potential. The waters are effective in soothing conditions including rheumatism, nerve pain, etc. and have a lotion-like quality that will leave your skin slippery-smooth after bathing.

Hakuen-no-yu hot spring is listed in the “Champion of the West” list that ranks the best outdoor onsens in Japan. It is visited by people from throughout the country and offers such facilities as outdoor baths, footbaths, bubble baths and even baths for pets. more
Though Tawarayama Onsen is situated in a mountain valley, the region is still close to the sea and plenty of fresh fish and delicious seafood can be tasted here. On the second floor of Hakuen-no-yu hot spring, there is a Japanese restaurant where you can enjoy tasty dishes in a relaxing atmosphere.
Located in Okayama Prefecture, Yubara Onsen is one of the three biggest hot springs in the Mimasaka area along with Yunotsu and Yunogo and has huge amounts of spring water, a natural sand bath and a magnificent view. The symbol of Yubara Onsen is the open-air bath called Sunayu (Sand bath) located in front of the dam along the Asahi River. It is listed in the “Champion of the West” list based on the National Open-Air Bath Ranking. Sunayu is the only mixed bathing facility that you can bathe free of charge in the western Japan. However, while Japanese people are very open in the scenes of bathing culture, going to an outdoor mixed-bathing onsen takes quite a bit of courage to foreigners.
There are three types of baths at Sunayu: Bijin no yu (hot spring of beauty), Kodakara no yu (hot spring of fertility) and Choju no yu (hot spring of longevity). more
The water is alkaline and has a temperature of about 48 to 60 °C. It is effective in treating nerve pain, fatigue and poor circulation. You can spend a relaxing time in the bath, enjoy the amazing view of Yubara Dam or admire the natural environment. 
Tamatsukuri Onsen is a historical hot spring located south of Lake Shinji in Shimane Prefecture. The picturesque hot spring area of Tamatsukuri is known as the “baths of the gods”. Yu-yu is a bathing facility that has a spacious and modern building with an indoor bath (shaped as a magatama), an outdoor bath, a shoulder-massaging waterfall shower and a sauna that are available for both men and women. The soft-served cherry ice after a bath is very popular! You can also spend your leisure time in the lounge or ping-pong area.
Tamatsukuri Onsen offers you the possibility to enjoy the benefits of Tamatsukuri’s nourishing water which is mildly alkaline and leaves your skin silky due to the strong effect of calcium. The hot spring warms the body and keeps it warm due to the sodium. The area is also known for the production of agate and magatama stones, more
which are closely linked to Shinto mythology.
Setouchi Onsen Tamanoyu in Okayama Prefecture is a great place where you can relax and enjoy the outdoor bath that overlooks the beautiful Seto Inland Sea. Here you will surely enjoy the scenic beauty of the Seto Inland Sea and the rich taste of seasonal dishes that will soothe your heart and body. The restaurant offers an authentic Kaiseki-style course menu that consists of fresh seafood and local products.
The water here is known for its healing properties because the radon it contains has medical properties. You can make a stop here before or after your trip to the islands of Setouchi region such as Naoshima (the closest one), Teshima, Inujima, and Shodoshima. You will have the possibility to lie down in a spacious tub of natural hot spring water overlooking the majestic scenery, more
relax even more with massages and spa treatments or try the bedrock sauna.