Písečný přesyp u Osečka

Písečný přesyp u Osečka is a small nature monument protecting a relic inland sand dune, situated on the eastern edge of the Kluk forest complex, less than a kilometer from the village of Oseček and roughly 3 km south of Poděbrady in the Central Bohemian Region. Covering less than one hectare, the site has been protected since 1989 for its rare geological form and its exceptionally rich fungal diversity.

How did the dune form?

The sandy ridge dates back to the end of the last glacial period, roughly 11,000–13,000 years ago, when strong winds carried sandy material eroded from the terraces of the Elbe river and deposited it into low dune-like hills. Inland dunes of this kind are uncommon in the Czech landscape today, making the site a valuable record of late-glacial geomorphological processes.

What grows on the sandy hill?

Vegetation here is tightly adapted to the poor, free-draining substrate. Parts of the reserve are covered by an open stand of Scots pine and silver birch, typical of dry sandy habitats, while other patches support nothing but mosses and lichens — organisms able to withstand extremely dry, nutrient-poor conditions.

Why is it a haven for rare fungi?

The reserve is best known as a habitat for sand-loving fungi: more than 80 species have been recorded here. Among them are species tied specifically to poor sandy soils, including a parasitic bolete, a blue-staining bolete, and the amethyst deceiver (a chanterelle-relative with distinctive violet coloring). Such a concentration of rare fungal species on such a small plot is remarkable even by national standards.

What animals live here?

The sun-exposed sandy surfaces also favor invertebrates adapted to arid microhabitats. The site is an important location for tiger beetles — fast, predatory ground beetles that hunt other insects — as well as antlions, whose larvae dig the characteristic funnel-shaped pit traps visible in loose sand. The presence of these species indicates the dune microhabitat remains in good ecological condition.

How to get there?

The monument lies on the eastern fringe of the Kluk forest, close to the village of Oseček in the Nymburk district. It makes for a convenient short hiking or cycling destination from nearby Poděbrady, combining natural history with the broader landscape story of the middle Elbe river valley.

Frequently asked questions

Can visitors walk freely through the reserve? As a protected natural area, the site calls for staying on marked paths and respecting nature-conservation rules — the goal is observation, not disturbance of the fragile sand habitat.

What makes this place ecologically significant? The combination of a rare geological feature — an inland sand dune — with an unusually rich fungal community of more than 80 recorded species on less than a hectare of land.

When is the best time to visit? Late summer and autumn are ideal for spotting fungal fruiting bodies, while spring and summer make it easier to observe sand-dwelling insects such as tiger beetles.