As komusubi of the West stands the spring of Dogo in Yoshu (Ehime Prefecture).
Dogo is counted among the oldest hot springs in Japan, and its origin is recorded in the Iyo Fudoki, compiled in the Nara period. The original is lost, but parts of it survive as quotations in other books. One tells this myth:
Long ago, when Okuninushi and Sukunahikona were traveling in the province of Iyo, Sukunahikona fell ill and was close to death. Okuninushi brought the hot water of Hayami in Oita (the springs of Beppu) all the way to Iyo through a channel under the ground, and bathed Sukunahikona in it. At once Sukunahikona recovered, said, "I seem to have slept for a while," and stood up strong. The print of his foot as he stamped the ground, it is said, remained on a stone beside the spring.
The fragments of the Iyo Fudoki also record that Prince Shotoku visited the spring with the Goguryeo monk Eji and others and set up an inscription beside it praising its wondrous power. Emperor Jomei, Empress Saimei and many other sovereigns are also said to have come here.
In the Edo period, the Matsuyama domain improved the baths at Dogo, providing separate baths for each social class, and they were crowded with bathers.