Watanoyu Annex
草津ホテル別館 綿の湯
An eight-room Kusatsu ryokan built around a rare milky spring
Lodging
Bathing & Water
Natural onsen water
Uses natural hot spring water
Outdoor BathNo
Open-air outdoor bath
Indoor BathYes
Enclosed indoor bathing area
SaunaYes
Sauna room of any kind
Cold BathYes
Cold water plunge bath, typically used after sauna
Bathing Arrangements
Mixed BathingNo
Shared bathing area for all genders
Policies & Services
TattooNo
Allows entry with visible tattoos
KidsNo
Welcomes children and families
Guests must be junior-high age or older; young children cannot stay.
ParkingYes
On-site or nearby parking available
Views
Mountains
RiverHighlights
Foot BathLoading map…
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Last updated September 19, 2026