National Route 403 is a national highway of

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

connecting

Chūō-ku, Niigata is one of the eight wards of Niigata City, Niigata Prefecture, in the Hokuriku region of Japan. It comprises much of the city centre. , the ward had an estimated population of 183,231 in 87,162 households and a population density of 4,900 pe ...

and

Matsumoto, Nagano is a city located in Nagano Prefecture, Japan. Matsumoto is designated as a core city since 1 April 2021. , the city had a population of 239,466 in 105,207 households and a population density of 240 persons per km2. The total area of the city ...

in Japan, with a total length of 352.8 km (219.22 mi).

References

{{Japan-road-stub National highways in Japan Roads in Nagano Prefecture Roads in Niigata Prefecture