The peat bog began forming approximately 6,000 to 7,000 years ago during the post-glacial period.
The water in the Great Moss Lake is tea-colored due to the high concentration of humic acids and dissolved peat.
The site is a protected habitat for the endangered bog-rosemary (Andromeda polifolia).
Peat depth in parts of the reserve reaches up to three meters.
The reserve serves as a sanctuary for various glacial relic species that persisted after the last ice age.
Rejvíz is a national nature reserve located in the Jeseník Mountains, known for housing the largest peat bog in Moravia. The site features a unique raised bog ecosystem with rare flora, including carnivorous round-leaved sundew. Visitors access the Great Moss Lake (Velké mechové jezírko) via a wooden boardwalk trail designed to protect the fragile wetland environment. The lake itself is a dystrophic pool characterized by dark, acidic water caused by high humic acid content. The surrounding forest consists primarily of spruce and mountain pine, providing a habitat for diverse moss species and insects. It is one of the highest-altitude settlements in the Czech Republic, situated at approximately 750 meters above sea level.
The viewing platform overlooking the Great Moss Lake, which offers a full reflection of the surrounding pines.
Stay strictly on the wooden boardwalks to avoid damaging the rare peat moss and sinking into the soft terrain.
Bring mosquito repellent, as the stagnant water in the peat bog creates an ideal breeding ground during warmer months.
Wear waterproof hiking boots, as trails leading to the boardwalk can remain muddy even after rain.
Attempting to deviate from the boardwalks, which is prohibited to prevent environmental damage and personal injury.
The nature trail is typically closed during the winter season due to snow and icy conditions on the wooden paths.
Stay on marked trails, do not pick plants, do not swim in the lake, and keep dogs on a leash.
