The ancient hot spring "Taiko no Yu" is located in Wakayama Marina City. The hot springs gushing out from a depth of 1,500 meters under the seabed come from geological formations that are approximately 100 million years old. In the glass-enclosed public bath, you can soak in the hot springs while looking out at the spectacular ocean view. The open-air bath is a rock bath, so why not soak in the sea breeze and be healed by the ancient hot water?