National Route 406 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

Ōmachi, Nagano is a Cities of Japan, city located in Nagano Prefecture, Japan. , the city had an estimated population of 27,559 in 11861 households, and a population density of 49 persons per km2. The total area of the city is . Geography Ōmachi is located w ...

and

Takasaki, Gunma is a Cities of Japan, city located in Gunma Prefecture, Japan. , the city had an estimated population of 372,369 in 167,345 households, and a population density of 810 persons per km². The total area of the city is . Takasaki is famous as t ...

in Japan, with a total length of 192.5 km (119.61 mi).

References

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