Seven Island Lake Nature Reserve
Gmina Węgorzewo, Poland · built 1956
Seven Island Lake Nature Reserve (Rezerwat przyrody Jezioro Siedmiu Wysp) is a nature reserve established in 1956 around Oświn Lake in north-eastern Poland, close to the border with the Kaliningrad Oblast of Russia.
NatureReserve data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).