Bathing Area

Sado Deep-Sea Water and the “Mother Sea”

Sado Island, in the Sea of Japan, is surrounded by the Tsushima Current, a surface oceanic layer that extends down to a depth of 200 meters. Below that is the so-called “Japan Sea Proper Water” where solar radiation cannot reach. This water, 200 meters and below, is also called “deep-sea water.”

Deep-sea water is so rich that it seems to contain almost all of the inorganic elements of the earth. Because its mineral ratios are nearly identical to those of amniotic fluid, which surrounds and nurtures babies in the womb, it is sometimes referred to as the "Mother Sea.”

Features of Sado Deep Sea Water

① Low temperature stability

The deep-sea water in the Sado Strait is called “Japan Sea Proper Water” and is characterized by very cold temperatures compared to the deep sea water of the Pacific. The average water temperature can be as low as 1 ° C, which is cold enough to suppress the breeding of bacteria. Its level of purity, therefore, is very high.

② Cleanliness

Deep-sea water never intersects with surface sea water, which is contaminated by river and atmospheric pollutants. In addition, since sunlight does not reach this depth, plankton and bacteria do not grow, maintaining a state of cleanliness.

③ Eutrophication

Since sunlight does not reach the water at depths of 200 meters or more, photosynthesis is not carried out and inorganic nutrients which are essential for plant growth, such as nitrate and phosphate, remain in abundance, without being consumed by bacteria.

Comfortable Bathing Time

Taking into account both Japanese and modern styles, we have designed large bathrooms and dressing rooms. You can check congestion of the baths on the TV in your room for maximum bathing convenience. Enjoy soaking in silky hot water for as long as you like.

Bathing time: 3:00pm - midnight / 5:00am – 9:00am

One-day bath: 1:00pm - 5:00pm / winter 1:00pm - 0:00am