Vättern

Vättern is a large, deep freshwater lake in southern Sweden, bordered by Västergötland and Östergötland. It is Sweden’s second-largest lake by surface area and drains north through the Motala ström.

Lake: A body of standing inland water occupying a basin. Vättern is a lake whose long, narrow basin shapes its shores and circulation.
Lake circulation: The movement and mixing of water within a lake, driven by wind, temperature, and density differences. Mixing redistributes oxygen and nutrients through Vättern’s deep water.
Vättern water supply: The systems that collect and distribute water drawn from Lake Vättern for public use. Several municipalities depend on the lake as a source of drinking water.
Jönköping: A city in southern Sweden at the southern end of Lake Vättern. Its waterfront marks the lake’s southern reach and hosts a major urban center.
Southern Sweden: The southern part of Sweden, including its densely populated and agriculturally productive regions. Vättern lies within this region and connects landscapes on either side.
Thermal stratification: The seasonal layering of lake water into zones with different temperatures and densities. Vättern’s depth allows seasonal layers to form and later mix.
Vättern fishing: Commercial and recreational fishing in Lake Vättern and its connected waters. The lake’s fish populations support regulated fisheries and angling.
Motala: A town in Östergötland on Lake Vättern, associated with canal construction and engineering. Motala sits at the lake’s northern outlet and the entrance to Göta Canal.
Västergötland: A historic province in western Sweden, east of Lake Vänern. Its eastern edge forms part of Vättern’s western shore.
Lake overturn: Seasonal mixing that breaks down temperature layers and circulates water through a lake. Overturn helps renew deep-water oxygen in Vättern.

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