The Křéby NNM lies in the parish of Prasklice and around 0.6km east of the village of Koválovice – Osičany on the borders of the Zlínský kraj – Zlín Region and Olomoucký kraj – Olomouc Region in central Moravia. The protected area was declared in 1956 to protect three enclaves of grassland on the right-bank valley slope of the Tištínka Stream. The monument covers an area of 3.52 hectares and lies in the warm (T2) climatic region.
Křéby NNM belongs to the Litenčická pahorkatina Hilly Country geomorphological unit and lies at elevations between 228 and 277 metres above sea level. The geological basement is predominantly built of calcareous clays and sands of the Carpathian Foredeep and the soil covering is predominantly of Cambisols and brown soils. A small overgrown quarry where sand and gravel was extracted is also included in the monument.
The territory is dominated by thermophilous grass-herb vegetation with many rare and protected plant species. The grasslands mostly belong to the Cirsion-Brachypodion pinnati alliance and are dominated by drooping tor-grass (Brachypodium pinnatum) and broad-leaved spignel (Peucedanum cervaria), which is only broken up by enclaves with the feather-grasses Stipa capillata and Stipa joannis. Rare or protected herbs which grow on these grasslands include the toadflax Thesium dollineri, the garlic Allium rotundum, the love-in-a-mist Nigella arvensis, golden flax (Linum flavum), narrow-leaved flax (Linum tenuifolium), the aster Aster amellus, lady orchid (Orchis purpurea), great pasque flower (Pulsatilla grandis), snowdrop windflower (Anemone sylvestris), broad-leaved everlasting pea (Lathyrus latifolius) and others. The rare steppe species of oyster mushroom Pleurotus eryngii has also been recorded here.
The national nature monument represents an important sanctuary for animals in an intensively farmed landscape. Interesting insect species which have been recorded at Křéby NNM include the ground beetles Ophonus strictus, Panageus bipustulatus and Demetrias atricapillus and the praying mantis (Mantis religiosa). Butterflies such as the Adonis blue (Polyommatus bellargus), silver-spotted skipper (Hesperia comma), the noctuid moth Omphalophana antirrhini and the scarce swallowtail (Iphiclides podalirius) can all be found here. The red-backed shrike (Lanius collurio) is a representative of the birds which nest at Křéby.