Lake Brunnsviken is a picturesque lake located in Stockholm, Sweden. It is part of the Brunnsviken Nature Reserve and is known for its scenic beauty and recreational opportunities. The lake is surrounded by parks and walking paths, making it a popular spot for both locals and visitors. The lake is approximately 2.5 kilometers long and connects to the Baltic Sea through the Fjällgatan channel. It is home to various species of fish and birds, contributing to the area's biodiversity. Brunnsviken also serves as a venue for various outdoor activities, including swimming, kayaking, and picnicking.