Kujukuri Onsen Chiba

Kujukuri Onsen Chiba is located near Sosa City on the Kujukuri Beach, one of Japan's longest ocean beaches stretching nearly 66 kilometres along the Pacific coast of eastern Chiba Prefecture — a vast arc of surf beach beloved by Tokyo surfers for its consistent Pacific swells, open horizon views, and the wide sandy shoreline that provides space for thousands of summer beachgoers without crowding. The chloride-rich hot spring waters draw from the Kazusa Formation geology beneath the Kujukuri coastal plain — an extraordinarily deep sequence of Pliocene and Pleistocene marine sediments deposited over millions of years as the Kanto Plain was repeatedly covered by ancient seas, whose chemical signature provides a uniquely historically marine therapeutic bathing experience. The combination of surfing culture, the vast Pacific beach horizon, and coastal hot spring bathing traditions creates an unusually energetic and outdoor-focused wellness destination where therapeutic mineral waters serve as recovery pools for surfers and beach athletes alongside the more traditional spa clientele of the Tokyo metropolitan fringe.