Natural hot spring Heiwajima 是东京大田区的体验项目。包括 地理ふしぎ発見【ゆっくり解説】 在内的 1 位 YouTube 旅行博主在 1 个片段里提到过它。
“[678.5s] Next up is the Yanglao Warning Hot Spring, located along the Yanglao River, which spans Ichihara City and Oki Town in Chiba Prefecture.”
