A hidden therapeutic bathing space woven from unheated natural spring water and a Japanese garden
Saitama Saitama City
"Minuma Natural Hot Spring Koharubiyori" is a day-trip hot spring facility located in Minuma Ward, Saitama City, with a serene Japanese atmosphere. It offers sodium-chloride strong saline spring water gushing from 1,500m underground as an unheated natural spring, with no added water or heating at all. The thick, brownish hot water can be enjoyed at a wide range of temperatures, from pleasantly lukewarm baths at body-neutral temperature to hotter baths. The sauna is a four-tier tower-style dry sauna, where gentle far-infrared heat wraps the entire body and encourages deep sweating. A pristine cold plunge bath fed by underground water and outdoor bathing in a Japanese garden that shows the changing seasons promise a blissful moment away from everyday life.
TypeNatural Hot Spring
A luxurious natural spring drawn from 1,500m underground and poured directly into the tub without adding water or heating. The thick brownish water, rich in minerals, warms the body from the core and leaves the skin smooth. In the lukewarm bath at body-neutral temperature, you can lose track of time and enjoy a long soak, experiencing the ultimate relaxation.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity16people
A spacious, four-tier tower-style dry sauna. Radiant heat from the far-infrared heaters gradually warms you to the core and supports a pleasant sweat. The top tier offers powerful heat, while the lower tiers provide milder temperatures, so you can bathe according to how you feel. It is a relaxing space where you can unwind in a friendly atmosphere while watching TV.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity5people
A luxurious cold plunge bath using underground water and fed by continuous flow. Water runs down the wall lined with binchotan charcoal, delivering a refreshingly cool cooldown. The soft underground water gently envelops your overheated body after the sauna and brings a crisp, refreshing sensation that seems to soak in from head to toe. It is deep enough for you to immerse yourself up to your shoulders.
Closed Days: None
〒337-0026 Saitama Prefecture, Saitama City, Minuma Ward, Someya 3-191
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more
A hidden therapeutic bathing space woven from unheated natural spring water and a Japanese garden
Saitama Saitama City
"Minuma Natural Hot Spring Koharubiyori" is a day-trip hot spring facility located in Minuma Ward, Saitama City, with a serene Japanese atmosphere. It offers sodium-chloride strong saline spring water gushing from 1,500m underground as an unheated natural spring, with no added water or heating at all. The thick, brownish hot water can be enjoyed at a wide range of temperatures, from pleasantly lukewarm baths at body-neutral temperature to hotter baths. The sauna is a four-tier tower-style dry sauna, where gentle far-infrared heat wraps the entire body and encourages deep sweating. A pristine cold plunge bath fed by underground water and outdoor bathing in a Japanese garden that shows the changing seasons promise a blissful moment away from everyday life.
TypeNatural Hot Spring
A luxurious natural spring drawn from 1,500m underground and poured directly into the tub without adding water or heating. The thick brownish water, rich in minerals, warms the body from the core and leaves the skin smooth. In the lukewarm bath at body-neutral temperature, you can lose track of time and enjoy a long soak, experiencing the ultimate relaxation.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity16people
A spacious, four-tier tower-style dry sauna. Radiant heat from the far-infrared heaters gradually warms you to the core and supports a pleasant sweat. The top tier offers powerful heat, while the lower tiers provide milder temperatures, so you can bathe according to how you feel. It is a relaxing space where you can unwind in a friendly atmosphere while watching TV.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity5people
A luxurious cold plunge bath using underground water and fed by continuous flow. Water runs down the wall lined with binchotan charcoal, delivering a refreshingly cool cooldown. The soft underground water gently envelops your overheated body after the sauna and brings a crisp, refreshing sensation that seems to soak in from head to toe. It is deep enough for you to immerse yourself up to your shoulders.
Closed Days: None
〒337-0026 Saitama Prefecture, Saitama City, Minuma Ward, Someya 3-191
Gender Access
Gender Separated
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more