Kurokawa Onsen

Kurokawa Onsen se encuentra en un estrecho desfiladero boscoso en Kumamoto, Kyushu, dentro de la zona volcánica del Aso. Unas 30 posadas ryokan operan en el valle, cada una con sus propios baños al aire libre rotemburo tallados en piedra y madera de ciprés. El sistema 'nyuto tegata' — un pase de madera — permite a los visitantes bañarse en tres posadas diferentes en un solo día. La coherencia arquitectónica del pueblo, mantenida por acuerdo colectivo, lo convierte en el ambiente de baño más evocador de Japón.

Kurokawa Onsen sits in a narrow forested gorge in the Minami-Oguni area of Kumamoto Prefecture, Kyushu, within the volcanic zone of the Aso caldera. Approximately 30 ryokan (hot spring inns) operate in the valley, each with its own distinct outdoor baths — rotemburo — carved from stone, cypress wood, and natural rock, positioned beside or above the Tanohara River. Unlike more commercialized onsen towns, Kurokawa has maintained its architectural coherence through a self-imposed design code: no neon signs, no large-scale hotels, no concrete structures visible from the bathing areas. The inns collectively offer the 'nyuto tegata' — a wooden pass that allows visitors to bathe at three different inns on a single day, creating an experience of moving through the village from bath to bath. The water is slightly acidic and sulphurous, clear to slightly milky depending on the inn, and the steam mingling with the cedar forest in the surrounding gorge creates an atmosphere widely regarded as the most evocative outdoor bathing environment in Japan. Kurokawa is often cited by Japanese travellers themselves as the onsen destination they would most wish to visit.

Kurokawa Onsenは日本・Kumamoto Prefecture, Kyushuに位置する温泉・硫黄泉。源泉温度は43℃、標高690mの地に湧出する。泉水は中性に近い（pH約6.8）の泉質、炭酸水素塩泉・ナトリウム泉を豊富に含む、総溶解固形物980 mg/Lが特徴だ。数世紀にわたる歴史を持つ。皮膚科治療・リウマチ療法・循環器系など多様な温浴療法が行われる。施設では露天風呂・川辺での入浴・乳頭手形（湯めぐり手形）などが体験できる。