The Tone River is the longest river in Japan, stretching approximately 322 kilometers. It flows through the Kanto region, starting from the mountains of Nagano Prefecture and emptying into the Pacific Ocean. The river is an essential water source for agriculture and industry in the surrounding areas. The Tone River is also known for its scenic beauty and recreational activities. It features various parks and walking trails along its banks, attracting visitors for fishing, boating, and cycling. The river plays a significant role in the local ecosystem, supporting diverse wildlife and plant species.