Södermanland is a historical province located in eastern Sweden. It is bordered by Lake Mälaren to the west and the Baltic Sea to the east. The region is known for its picturesque landscapes, including forests, lakes, and archipelagos, making it a popular destination for outdoor activities. The capital of Södermanland is Nyköping, which has a rich history and is home to several historical sites, including the Nyköping Castle. The province is also known for its agricultural production, particularly in crops and dairy farming, contributing to the local economy and culture.