This is the 333rd most frequent Finnish word.
varrella
"Varrella" means "along" or "by" (referring to a location, such as along a road, river, etc.).
In this sentence, 'varrella' indicates location, specifically being alongside or near the river.
Kävelimme joen varrella.
We walked along the river.
Here, 'varrella' describes proximity, showing that the tree is located beside the path.
Puu kasvaa polun varrella.
A tree grows by the path.
In this usage, 'varrella' expresses being next to or near the road during the mentioned time period.