谷筋

1. Origins, structure, and basic meaning

• Structure: 谷筋, read たにすじ, combines 谷 (valley) with 筋 (a continuing line or course).
• Basic usage: It is a noun for a valley's course or the terrain along it.

2. Common pitfalls and similar expressions

• Following a route
  • 谷筋に沿って means along the direction in which the valley extends.
  • In 谷筋をゆっくり上ってきた, を marks the route the mist slowly rose along, not an object being manipulated.
• A noun, not a preposition
  • Although 谷筋 can appear in an English phrase such as 'along the valley,' the Japanese word itself is a noun. Particles and following expressions supply the relation 'along.'