Sisjön, Lake and nature reserve in Gothenburg, Sweden

Sisjön is a lake with a nature reserve in Gothenburg featuring walking paths, wooden bridges, and observation platforms around its perimeter. The network of trails connects multiple entrance points and provides direct access to the water and surrounding landscape.

The name Sisjön is a corruption of Skärsjön, recorded as Siersiöen in 1666, Sier siöö in 1694, Siön in 1725 and Skärsiöen in 1785. The prefix skäl- refers to a boundary between the former Askim and Fässberg parishes, with the boundary stone at Skärsiöhall noted in the Göteborg court book of 1785. An older name for the lake is Balltorpsjön.

The reserve serves as a gathering space where residents connect with the local natural world during their daily routines. Walking around the water reveals how the place has become part of the community's relationship with nature and outdoor activities.

The reserve is accessible from three main parking areas at the entrance points and welcomes visitors throughout the year. Swimming and fishing are available in designated zones during the warmer months, with the best experience starting from a marked entrance.

The name Sisjön is a corruption of Skärsjön, recorded as Siersiöen in 1666 and Skärsiöen in 1785; the prefix skäl- referred to the boundary between the Askim and Fässberg parishes, whose boundary stone stood at Skärsiöhall. The lake was also formerly called Balltorpsjön.