Explore details about location 国道４００号. 国道４００号 is a location situated within the 那須塩原市 alongside other areas such as 国道４００号, 中塩原板室那須線, 塩原矢板線. Additionally, some smaller parts of 国道４００号 include specific areas like 関谷上石上線 adding to the diversity of its landscape.