Aioi Onsen Hyogo

Aioi, a small industrial port city at the head of Ako Bay in western Hyogo Prefecture, is historically associated with the Harima Kako River delta industrial zone that includes significant shipbuilding facilities, and the city's port heritage as a loading point for Banshu stone and materials from the Harima quarries has defined its compact maritime industrial character. Aioi Onsen Hyogo draws on chloride-rich thermal waters from the marine geological formations of the Ako Bay coastline, offering warming maritime baths in a compact port city whose working harbour atmosphere and bay scenery create an authentic alternative to the more touristy thermal destinations of the Hyogo coast. The nearby Ako City with its Forty-Seven Ronin historical site — the most celebrated tale of samurai loyalty in Japanese history — the Ako Castle ruins, and the traditional sea salt production heritage of the Harima coast provide rich cultural context for thermal spa visitors to western Hyogo.