Large Stone (Nagy-kő), Bárna

Natural area of local importance.

How to get there

The 519-meter-high Nagy-kő, which rises above the Barna, can be reached from the settlement via the blue strip through the Zához Valley or the blue triangle.

Geomorphological features

The basalt peaks formed during the Volcanic period around the Medves alternate with black columnar basalt blocks and gray stratified basalt. Earlier quarrying produced the latter, the remnant of which is a stage-like formation on the rock. If we look at the area in terms of volcanic eruption centers, the Nagy-kő can be classified as the neck, where basalt lava either solidifies in the cleft or fills the inside of the volcanic crater. These formations are predominantly composed of basalt lava, which is resistant to external forces, and therefore have significant surface geologic value and landscape-forming role. Their geological value lies in the various forms of basalt separation and their relationship to each other.


Many valuable plant species are settled on the rock and in the surrounding forests. The Northern Ridge (Asplenium septentrionale) is located on the basalt rock. Anemone ranunculoides is a less bulky early spring species, but its populations are rather isolated in the area. The hazelnut bladder (Staphylea pinnata), which is characteristic of the debris forests, reaches a height of 2 m in the area, which is quite rare. In closing and closed grasslands formed by calcareous sandstone, Onosma arenarium is found in sandy grasses, Scutellaria altissima is high in debris, and Orobanche alba are found in open grasslands under sandstone walls. Corydalis solida is present in the area with rather isolated populations. The basalt lava is home to 3 developed stems of the Aurinia saxatilis. In dry oak forests spotted lettuce (Lactuca quercina) and green-flowered marshmallow (Silene viridiflora) appear sporadically. In the beech forests, with oak-sessile oak trees, have some stems red bird horns (Cephalanthera rubra). The yellow-leaved sage (Carex michelii) is sporadic in downy oak and shrub-sessile oak. Stipa capillata are found on slopes of sandy soils and abandoned pastures. Very small, fragmentary populations of Stipa pennata live on basalt skeletal soils of southern exposed sites. On the crumbly decaying basalt we can find the Chrysopogon gryllus.