This is the 5436th most frequent Turkish word.
köylere
"To the villages."
In this sentence, "köylere" is used as the dative case of "köyler" (villages), indicating the direction or purpose of the action (going to the villages).
Biz köylere yardım etmek için gittik.
We went to the villages to help.
Here, "köylere" is again in the dative case to signify the target or recipient (villages) of the improvement in transportation.
Köylere ulaşımı kolaylaştırdılar.
They facilitated transportation to the villages.
"Köylere" in this sentence represents the entity to which something is directed or related (trust towards the villages).