On the windswept Baltic coast, where the Vistula River meets the sea, you’ll find Rezerwat Przyrody Mewia Łacha — one of Poland’s most unique and important birdwatching locations. This protected nature reserve near the river’s estuary is a key stopover site for thousands of migratory birds, including the Dunlin (Calidris alpina) — a small, fast-moving wader known for its distinctive plumage and constant motion.