Ånnsjön, Protected lake and wetland site in Jämtland County, Sweden

Ånnsjön is a large lake and wetland site in Jämtland in northern Sweden with significant depth in its southern portion and extensive surface coverage. The protected area features a dense network of walking paths, boardwalks, and observation towers for birdwatchers distributed throughout the landscape.

The lake shores have been inhabited since 6,000 to 7,000 years ago, as evidenced by more than 60 archaeological fishing settlements discovered around its perimeter. This reveals a continuous human presence stretching back to the earliest periods of the region's past.

The small timber chapel beside Handöl was built in 1806 to serve Sami from Undersåker and Åre, making it the oldest such chapel in Jämtland. Its pulpit and altar triptych came from Frösö church, and a tablet inside commemorates the 600 Caroleans buried nearby on 20 January 1719.

The site is easily accessible via European route E14 and offers a network of trails suited to different activity levels and interests. The observation towers and boardwalks are positioned to give visitors straightforward access to the most rewarding areas without requiring special equipment.

The lake's name is also recorded in Southern Sami as Ånne. In 1897 English Admiral Sir William Robert Kennedy and his brothers came for fishing and hunting, and his family stayed for sixty years; in July 1909 a dispute over fishing rights in the north-eastern part of the lake was reported as a "naval battle on Ånnsjön".