The Matsukawa River is a river located in Japan, primarily flowing through the Nagano Prefecture. It is known for its clear waters and scenic surroundings, making it a popular spot for outdoor activities such as fishing and hiking. The river is part of the larger Chikuma River system, which contributes to the region's rich biodiversity. The river's banks are lined with various trees and plants, providing a habitat for local wildlife. Additionally, the Matsukawa River is often celebrated for its seasonal beauty, particularly during the cherry blossom season when the area attracts many visitors.