The Shinano River is the longest river in Japan, stretching approximately 367 kilometers. It flows through the central part of the country, starting in the Japanese Alps and emptying into the Sea of Japan. The river is known for its scenic beauty and plays a vital role in the region's agriculture and transportation. The river basin supports various ecosystems and is home to numerous species of fish and wildlife. It also serves as a crucial water source for cities and towns along its route, including Nagano and Niigata. The Shinano River is an important cultural symbol, often featured in Japanese art and literature.