Byriuchyi Island was formed as a result of reclamation of sand and limestone, so its western coastline has many bays and coves. Along the coast there are many lakes. The climate on the island is temperate, continental, with long hot summers. It is dominated by vascular plants — reed, bulrush, bluegrass etc. The island has meadow and sandy steppe landscapes. In the 70-80-ies of the last century the forests of narrow-leaved oleaster, elm, locust, and ash, were planted, covering the total area of 232 hectares.
The fauna of the island is represented predominantly by cloven-hoofed animals — there are red deer, fallow deer, kulans, horses and mouflon. Also, there are foxes, raccoon dogs, and pheasants. Most plants and animals are acclimatized, as up until the 20s, the Island had a poor wildlife.