Japan National Route 18 is a major highway that runs through the central part of Japan. It connects the cities of Nagano and Niigata, covering a distance of approximately 150 kilometers. The route is known for its scenic views, passing through mountainous regions and rural landscapes. This national route serves as an important transportation link, facilitating travel and commerce between the two prefectures. It is part of the larger network of National Routes in Japan, which are crucial for connecting various regions across the country.