Černé jezero, or the Black Lake, is the largest natural lake in the Šumava National Park in the Czech Republic. It is situated at an elevation of 1,000 meters and is known for its dark, deep waters, which are surrounded by dense forests and stunning mountain scenery. The lake is a popular destination for hiking and nature enthusiasts. The lake has a maximum depth of about 40 meters and is fed by underground springs. It is home to various species of fish and aquatic plants, making it an important ecological site. Visitors can enjoy activities such as fishing, swimming, and exploring the surrounding trails.