Japan National Route 51
|Length||124 km (77 mi)|
|National highways of Japan|
Expressways of Japan
- Length: 124 km (77.05 mi).
- "一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 19 February 2020.
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