Lake Hjälmaren is the fourth largest lake in Sweden, covering an area of approximately 480 square kilometers. It is located in the province of Örebro and is known for its rich biodiversity, including various fish species and birdlife. The lake is fed by several rivers and has a number of islands, making it a popular destination for outdoor activities. The lake plays an important role in the local ecosystem and economy. It supports fishing, boating, and tourism, attracting visitors to its scenic landscapes. Additionally, Lake Hjälmaren is connected to the Gota Canal, enhancing its significance for transportation and recreation in the region.