The mud volcanoes from Filiaș
The just 1 ha area of geological reserve is located on the southwestern part of Filiaș, in the Sucoro valley. These mud volcanoes follow the spread of gas-domes.
These are cold water mud volcanoes, created in the presence of natural gas domes, more or less in loose soils rich in clay. They were formed in the autumn of 1913. One of the three mud-cones is already covered by vegetation; the other two are still active.
Because of the fact that the water here contains salt, we can find here the marsh arrowgrass (Triglochin palustris).
Text and photo source: http://www.greenharghita.ro