noun which may take the genitive case particle 'no', noun
along a mountain; along mountains
Describes a route, road, railway, or area that runs alongside or follows the contour of a mountain or mountain range.
山沿いの道はカーブが多い。
The road along the mountain has many curves.
この鉄道は山沿いを走っている。
This railway runs along the mountains.
Compound of 山 (yama, 'mountain') + 沿い (zoi, 'along'), the continuative form of 沿う (sou, 'to run along').