Mire vegetation of the Muránska planina Mts and adjacent parts of neighbouring orographical units was classified by national formal definitions of mire associations. Vegetation plots were arranged from rich fens over moderately rich fens towards poor Sphagnum fens and raised bog. This fact was confirmed by a strong and significant correlation of the DCA site scores on the first axis with the measured pH and water conductivity. The second DCA axis correlated with mean Ellenberg indicator values for both temperature and soil nutrients. The study region was found to be conspicuously less diverse than the distribution centres of mire habitats in Slovakia (Orava and Vysoké Tatry regions), but more diverse than most of other marginal regions of mire distribution. Relatively high beta diversity of mires was probably caused by variable bedrock and local climate.