Ubara Onsen

Ubara Onsen is located in Isumi City, Chiba Prefecture, on the outer Boso Peninsula coast where the Pacific Ocean creates a dramatic shoreline of wave-carved cliffs, hidden beaches, and the raw coastal energy that distinguishes the outer Boso from the more sheltered Tokyo Bay side of the peninsula. The siliceous thermal waters here provide mineral spring bathing in a coastal community whose rugged Pacific-facing character, traditional fishing heritage, and proximity to some of Chiba Prefecture's most dramatic natural coastal scenery make it a distinctive destination on the outer Boso circuit. These onsen complement the Isumi area's growing reputation as a destination for those seeking authentic rural coastal life, combining therapeutic siliceous mineral bathing with the wild Pacific coastal atmosphere that has made the outer Boso Peninsula one of the Kanto region's most sought-after retreats from metropolitan Tokyo.