This is the 7696th most frequent Russian word.
запорожью
"Запорожью" refers to the Zaporizhzhia region or area in Ukraine.
The word "запорожью" here indicates the geographic region of Zaporizhzhya, used in a locative sense.
На запорожью много памятников древней архитектуры.
In Zaporizhzhya, there are many monuments of ancient architecture.
In this sentence, "запорожью" is used to refer to exploring the region of Zaporizhzhya, illustrating motion across the area.
Мы часто путешествовали по запорожью в юности.
We often traveled through Zaporizhzhya in our youth.
Here, "запорожья" is in a form expressing possession or association, referencing the history of the place.