Carbonic acid spring
Obama Hot Springs is known for its salt springs with a high temperature of over 100°C, but the carbonic acid spring here is the only cold spring in Obama. It gushes out in a square in the back alley of the hot spring resort, making a bubbling sound. The spring water has a low temperature of around 25℃. Unlike neighbouring hot springs, it is characterised by its sulphurous smell and high iron and carbonic acid content. From the end of the Meiji period (1868-1912) to the early Shōwa period (1926-1989), it was also used as cool drinking water, with a carbonated water sensation.