The Kiso Three Rivers refer to three significant rivers in the Kiso Valley of Japan: the Kiso River, Ibi River, and Nagara River. These rivers are known for their scenic beauty and play a vital role in the region's ecology and economy. They provide water for agriculture, support local wildlife, and are popular for recreational activities like fishing and boating. The Kiso Valley is also famous for its historical significance, as it was part of the ancient Nakasendo route connecting Kyoto and Edo (now Tokyo). The rivers have shaped the landscape and culture of the area, making it a popular destination for tourists interested in nature and history.