The Šejval NNM lies to the north of the village of Radhošť in the Pardubický kraj – Pardubice Region and covers an area of 2.34ha. The protected area was declared in 1982 and consists of a small fishpond with the neighbouring meadow and forested area in the middle of an intensively farmed area.
The fishpond lies in a shallow basin in the spring area of a right-bank tributary of the Loučná river. The basement is of alluvial sediments, which lie on calcareous claystones and marlstones.
The main subject of the protection at the time when the monument was declared was the occurrence of the aquatic plant - marestail (Hippuris vulgaris) and this was the only locality in the east Bohemian region where it was known to grow. However, the marestails have been missing since 1996. Other rare and protected species which grow on the fen meadow by the pond include the mouse garlic (Allium angulosum), broad-leaved marsh orchid (Dactylorhiza majalis), adderstongue (Ophioglossum vulgatum) and meadow saffron (Colchicum autumnale).
The forest stand in the monument is comprised of alders and willows and fulfills a protective function as it effectively isolates the territory from the surrounding area, which is intensively farmed.
Common toads (Bufo bufo) and edible frogs (Rana skl. esculenta) breed in the pond. Reed warblers (Acrocephalus scirpaceus) and sedge warblers (Acrocephalus schoenobaenus) regularly nest in the reedbeds around the pond while nightingales (Luscinia megarhynchos) nest in the bushes around the pond. The neighbouring meadows are home to rich insect communities. After the harvest on the surrounding fields the territory becomes an important source of food and water and the species spectrum increases to include more birds and game animals.
The meadows are cut by hand once a year. The Šejval monument can be observed from the road between Radhošť and Jaroslav, which runs alongside the meadow and across the dam of the pond.