Description: This lake surrounded by a small forest evocates the Ice Age. There are turf moors with Sphagnum-moss on the lake, became a special so-called transitional moor. Two famous botanists Imre Máthé and Margit Kovács discovered this Sphagnetum moor association, called Nyírjes (Birch-grove) in 1957 during their researches conducted in the Mátra-mountains. This type of flora and association could remain in Hungary only at special provenances with special conditions, with some plant species being the foremost rarities of Hungary. Thelake was formed in a 2-3 meters deep valley without outflow bordered by north-eastern slopes of the Darnó-mountain on riolitic tufa stones. Total area is approx. 1 hectares, located 280 meters above sea Level. The area is inhabited by species of the Sphagnetum moor association, which are less intolerant towards acidity of the soil. The Sphagnetum moor association- is therefore dominated by the species Sphagnum palustre and Sphagnum recurvum. Other four Sphagnetum moor moss species occur in lesser populations on the area.
Location: The nordeast Part of the Darnó mountin near to Sirok village.
Charachteristic (natural value): zoological value, botanical value, water habitat