Between Vättern and the Baltic
Deep Lake Vättern and the height of Omberg define the western edge, while islands and shallow inlets take over along the Baltic coast. Between them lies the broad agricultural plain on fertile soils. Ground rises and becomes more heavily wooded to both north and south. Nearly two-thirds of the county is forest, despite the visual dominance of its open central farmland.
The transitions carry much of the biological variety. Oak pasture and broadleaved woodland survive where farming country meets forest, while calcareous fens and grassland develop where lime influences soil and water. Pine is characteristic of much of the coast; mixed conifer forest, cliffs and lakes shape the northern and southern uplands. These habitats overlap in a mosaic rather than forming four rigid belts.
A lowered lake transformed by birds
Tåkern demonstrates how human intervention can redirect an ecosystem. Its water level was lowered between 1842 and 1844 to gain farmland, leaving a lake shallow enough for sunlight to reach extensive submerged vegetation. Invertebrates, molluscs and fish multiplied, reeds expanded and Tåkern developed into one of northern Europe’s foremost bird lakes. A total of 278 bird species has been recorded, with about 130 breeding inside the reserve.
At Ombergsliden, bedrock and groundwater operate at a smaller scale. Lime-rich but nutrient-poor water feeds open fens within the forest. Several orchids grow here, including rare fragrant orchid, while black bog-rush has persisted since the retreat of the ice sheet. Butterflies on grazed ground and uncommon land snails in the wet fens add to the diversity created by calcareous conditions.
When solid rock opens
Trollegater records the physical force of post-glacial uplift underground. As the weight of the ice sheet disappeared, stresses opened fractures and shifted great blocks. The result is one of Sweden’s largest cave systems in crystalline bedrock; the passages of the main cave total 110 metres. Above them, older conifer forest and deep fissures continue the same geological story.
Ågelsjön reveals fractured bedrock on a landscape scale. The clear lake occupies a deep valley beneath dramatic fault scarps and mature woodland. Ice-age relict crustaceans survive in the water, while old pines, coarse spruce logs and humid south-facing slopes support uncommon insects, fungi, lichens and mosses. Together Tåkern, Ombergsliden, Trollegater and Ågelsjön turn the county’s contrasts between plain, lime-rich ground, caves and forest lake into distinct places.
