Residents can have water filled into containers at the spring. Many households have a direct water connection and receive the water, which is believed to have healing properties, straight into their homes: for bathing, cooking and making tea. Tsubo-yu is renowned for being the oldest hot spring in Japan. This mysterious hot spring is a small rock bath which can fit about two adults, and the color of the hot water changes seven times each day. Wakayama Prefecture, Japan