The Cave of the Sajó Basin
The Sajó Basin lies between the Bükk Mountains and the Aggtelek Karst. It extends to about 150 km2. The axis of the basin is the 2 - 3 km wide alluvial plain of the Sajó River.
To the south and to the north the basin is bordered by low terraced hills. The northern hills are formed from descending escarpments of the Bükk Region and the Upponyi Mountains. The southern hills are known as the Putnoki Hills. Both types of landscape are strongly dissected by erosion valleys and have a varied geological build up. They are composed of Miocene sediments such as compact clay ("slir" formation), sandstone, marl and volcanic formations such as rhyolite- andesite tuffs and andesite agglomerate.
Only one cave is known in this area, the "Nagy-kõ-odúja". It opens in the northern hills 1 km from Sajókaza. The 2.9 m long and 1 m high cave has developed as a result of tectonic movement in an adesite agglomerate cliff, which rises from its tufaceous environment.