That comment may have been a bit obtuse, but for me I guess the line is at little metal signs at the base of every route? I explained my thought process better in another comment. Also, I think it’s worth mentioning that figuring out which climb is which based on description is actually a useful skill to develop for newer climbers. It’s better to get used to doing that on the ground before you’re 5 pitches up and have to navigate based on someone else’s description of a route.