Bathing & Water
Natural onsen water
Uses natural hot spring water
Outdoor BathYes
Open-air outdoor bath
Indoor BathYes
Enclosed indoor bathing area
Capabilities
Mixed BathingNo
Shared bathing area for all genders
Policies & Services
ParkingYes
On-site or nearby parking available
Views
RiverAbout
Izumiya has been a family-run inn at Shimoda Onsen (天草下田温泉) in Amakusa since 1884. The ryokan has its own spring source, kept kakenagashi (not heated, not diluted, not recirculated). The water is soft and clear with a faint sulfur scent. Both the men's and women's sides have an indoor bath and an open-air bath. All seven Japanese-style rooms look out over the Shimotsumine River.
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Last updated June 23, 2026