The National nature reserve of Odkryv is located in an area of an ex-mining pit near Kravare and is 1.6 ha large. Sand mining historically produced till and gravel sand at the site which were produced by Salske’s glacier ( approx. 300 000 years ago).
This nature reserve is a unique and comprehensive complex of wetland meadows, flood plains and sparse greens with ox bow lakes and periodically flooded pools in the alluvial plain of the river Opava. It is a biotope of several vulnerable and rare species of animals and plants. The Reserves of Koutske and Zabrezske meadows are the most valuable wetland areas within Hlucinsko.