This is the 10002nd most frequent Russian word.
аренах
"Аренах" is the prepositional plural form of "арена," meaning "arenas" or "stadiums" in English.
The word 'аренах' is used here in the plural prepositional case to refer to the locations where events occur.
Соревнования проходят на лучших аренах города.
The competitions take place in the best arenas of the city.
Here 'аренах' denotes the venues with emphasis on distinctions or prestige, again in plural prepositional case.
На этих аренах выступили мировые звезды.
World stars have performed in these arenas.
In this sentence, 'аренах' emphasizes the settings of historical occurrences, in plural prepositional case.