To get to the source, you have to swim against the current

By dojść do źródła, trzeba płynąć pod prąd

Ustrzyki Dolne

Ustrzyki Dolne (Ukrainian: Устрики Долішні, Russian: Устрики Дольные) - a city in the Podkarpackie Voivodeship, the seat of the Bieszczady poviat, located on the Strwiąż River.

https://walkinginthepolishmountains.blogspot.com/2019/08/ustrzyki-dolne.html