open-air bath
An outdoor bath, typically at a hot spring or inn, often with natural scenery. Similar to 露天風呂 (ろてんぶろ), but 野天風呂 can imply a more rustic, natural setting.
We could see the ocean from the inn's open-air bath.
露天風呂 is the more common term for an open-air bath. 野天風呂 often emphasizes a natural, rustic setting, sometimes without a roof but still part of a bathhouse.
Compound of 野天 (のてん, 'open air, outdoors') + 風呂 (ふろ, 'bath'). The exact origin is uncertain, but it likely arose to describe baths in natural outdoor settings.