Lake Mälaren is a large lake located in central Sweden, primarily in the province of Uppland. It covers an area of approximately 1,140 square kilometers and is the third-largest lake in Sweden. The lake is connected to the Baltic Sea through the Mälaren Canal and is known for its beautiful islands and scenic landscapes. The lake is surrounded by several cities, including Stockholm, the capital of Sweden, which lies at its eastern end. Lake Mälaren is an important waterway for transportation and recreation, offering opportunities for boating, fishing, and swimming. Its rich history includes numerous castles and historical sites along its shores.