The Vistula Lagoon is a shallow, semi-enclosed body of water located on the border between Poland and Russia. It is part of the larger Vistula River system and connects to the Baltic Sea through the Baltiysk Strait. The lagoon covers an area of approximately 838 square kilometers and is characterized by its brackish water, which is a mix of fresh and saltwater. The lagoon is an important ecological area, supporting diverse wildlife, including various bird species and fish. It also serves as a popular destination for recreational activities such as sailing, fishing, and birdwatching, attracting both locals and tourists to its scenic shores.