Tysjöarna is one of the largest marl areas in the world. Apart from the marl fieldes, there are several springs and richfens with calcareous tufa formations. Many rare plants and animals live in the calcium-rich environment.
The southern lake dries up during the summer and is no longer as interesting for birdlife. Therefore, if you want to watch from the bird tower beside the southern lake, it is recommended that you do so early in the season.
During the summer, you should head for the northern lake and its two bird towers if you want to watch the nesting birds.
There is no access to the marl fields from 15 April to 31 July. Please keep to the paths, plankways and towers so you don't disturb the breeding birds.