The Kaifu River flows through the southern part of Tokushima Prefecture and empties into the Pacific Ocean. With a deep forest at its source, it is known as one of the clearest rivers in Shikoku. This pure water is a treasure trove of creatures. Japanese eels are among the many fish swimming in the river. In autumn, countless ayu sweetfish gather in the shallow areas downstream for their spawning period. Great egrets and other birds come to hunt for the sweetfish as they rush to leave their offspring. And some unexpected enemies also come after the eggs. Visit Kaifu River in autumn to see life in action.