This is the 1055th most frequent Russian word.
округе
"Округе" is the prepositional case of "округ," meaning "district" or "region" in English.
In this sentence, 'округе' refers to an administrative district or neighborhood where the action is taking place.
В нашем округе построили новый парк.
In our district, a new park was built.
Here, 'округов' (plural form) denotes larger administrative or geographical areas.
Река протекает через несколько округов страны.
The river flows through several regions of the country.
In this sentence, 'округами' (instrumental plural) again signifies administrative divisions whose borders are described.