This is the 499th most frequent Russian word.
странах
"Странах" is the prepositional plural form of "страна," meaning "countries."
'странам' is in dative plural form, used with the preposition 'по' to indicate direction and location across the mentioned entities.
Я путешествовал по разным странам.
I traveled through different countries.
'странах' is in prepositional plural form, used to specify the location within the mentioned entities.
В некоторых странах климат значительно отличается.
In some countries, the climate differs significantly.
'странах' is in prepositional plural form, used with 'во' to denote location within the entities referenced.