Meaning of “along” - Learner’s Dictionary

along

preposition us uk /əˈlɒŋ/
We drove for miles along dusty roads.They ran barefoot along the wet beach.They strolled along the beach.We walked along the seafront.She sprinted along the road to the bus stop.
DIRECTION

A2 from one part of a road, river, etc to another:

a romantic walk along the beach
NEXT TO

B1 in a line next to something long:

a row of new houses along the river
PARTICULAR PLACE

at a particular place on a road, river, etc:

Somewhere along this road there's a garage.

(Definition of “along preposition” from the Cambridge Learner’s Dictionary © Cambridge University Press)