The dam was built by royal order as early as the 17th century, when Österbysjön and Dynsjön were dammed up to form a large lake, about five kilometres long and one kilometre wide.

The trail follows the historic dam embankments that were built to hold back the water. You'll follow the path of generations of labourers who maintained the dam over the centuries. The walk takes you through woods, across marshes and along the shoreline - mostly on easy paths. On some stretches, especially south of the dam, the trail also follows a forest track. The tracked sections make it easy to cross wet ground while protecting nature from wear and tear.

Five kilometres of the trail follow the existing Upplandsleden between Österbybruk and Gimo and are marked in orange. The remaining nine kilometres will be newly built in 2024 and are marked in blue.

Along the way there are several nice rest areas. In Aspbo nature reserve there are two barbecue areas and at Knabohälla you will find a barbecue area, wind shelter and a jetty - perfect for a break or as a starting point for a trip by canoe or boat.