Locknesjön, Natural lake in Jämtlands län, Sweden

Locknesjön is a freshwater lake in Jämtland with clear, deep waters that support various fish populations. The lake sits approximately 23 kilometers from the city of Östersund.

Locknesjön occupies the Lockne crater, formed about 458 million years ago when part of a 600-metre asteroid struck Earth. The impact site then lay roughly 500 metres below sea level. A fragment of the same asteroid created the nearby Målingen crater, about 16 kilometres to the south.

The lake lies in Lockne parish, whose name comes from Old Norse "lok", meaning brook or stream, referring to the Forsaån outlet. The crater itself is named Locknekratern after the parish. Anglers fish the lake, which drains via Forsaån into Bodsjön.

The shoreline offers multiple access points with designated fishing spots and boat ramps that are most usable during warmer months. Visitors should know that conditions vary significantly by season.

Locknesjön is one of a pair: about 16 km south, another fragment of the same asteroid struck and formed the Målingen crater, now marked by the Målingen formation in Lake Näkten near Hackås. The two impacts are counted together as evidence of a single breakup event.