Altitude: 237–240 m above sea level
Area: 3.9 ha (oldest sand mine excavation lake – natural monument) and 8.6 ha (younger lake)
Material: Early Quaternary (Pleistocene) sand and gravel washed by the Orlice River

 

The sand mine, where mining ceased in the 1970s, was declared a natural monument in 1983. Communities of exposed sands, wet alder forests and ponds are the object of protection there. Management interventions such as removal of woody debris, dredging of pools, removal of sod, cutting of fast spreading Common Reed and the Wood Small-reed, have been implemented against the overgrowth of the sands. Breeding of Fallow Deers and fish overpopulating have caused an undiserable eutrophication (excessive nutrient enrichment). To the north-west of the site there is a sand pit, which was mined between 2000 and 2016. Southwest of the natural monument, a new sand pit was opened in 2018 and mining is still ongoing.

 

Fungi

Associated with early succession woody plants: brittlegill Russula clavipes, Gumtree Deceiver (Laccaria fraterna), Frosty Webcap (Cortinarius hemitrichus), Hoary Milkcap (Lactarius scoticus), poisonpie Hebeloma pseudofragilipes

 

Plants

Sand-loving species: Small Cudweed (Filago minima), Field Cudweed (Filago arvensis), Rat's-tail Fescue (Vulpia myuros), nahoprutka písečná (Teesdalia nudicaulis), Shepherd's Cress (Agrostis vinealis), Corn Chamomile (Anthemis arvensis), chamomile Athemis ruthenica, Spring Speedwell (Veronica verna), Spring Vetch (Vicia lathyroides)

Wetland species: Marsh Clubmoss (Lycopodiella inundata), Red Pondweed (Potamogeton alpinus), Round-leaved Sundew (Drosera rotundifolia)

 

Invertebrates

Wetland species: Blue Featherleg (Platycnemis pennipes), Blue-tailed Damselfly (Ischnura elegans), Emperor Dragonfly (Anax imperator), Broad-bodied Chaser (Libellula depressa)

 

Vertebrates

Sand-loving species: Sand Lizard (Lacerta agilis); Sand Martin (Riparia riparia)

Wetlend (or wetland and dryland combination) species: Smooth Newt (Lissotriton vulgaris), Alpine Newt (Ichthyosaura alpestris), Common Spadefoot (Pelobates fuscus), European Common Toad (Bufo bufo), European Treefrog (Hyla arborea), Moor Frog (Rana arvalis), Lake Frog (Pelophylax ridibundus); Grass Snake (Natrix natrix)