Kosterhavet is a marine national park located off the west coast of Sweden, near the Koster Islands. Established in 2009, it is known for its rich biodiversity, including various species of fish, seals, and unique underwater habitats. The park covers an area of approximately 400 square kilometers, making it one of the largest marine protected areas in Sweden. The park is a popular destination for outdoor activities such as kayaking, diving, and hiking. Visitors can explore the stunning coastal landscapes and enjoy the diverse marine life. Kosterhavet plays a crucial role in conservation efforts, helping to protect the delicate ecosystems found in the region.