The Shinanogawa River is the longest river in Niigata Prefecture, Japan, stretching approximately 367 kilometers. It originates from the Mikuni Mountains and flows into the Sea of Japan. The river plays a crucial role in the region's ecosystem and is vital for agriculture, providing irrigation to surrounding farmlands. The river is also known for its scenic beauty, with picturesque views along its banks. It supports various recreational activities, such as fishing and boating. Additionally, the Shinanogawa River is an important waterway for transportation and has historical significance in the development of the local communities.