Vulcanii Noroiosi Paclele Mari

Vulcanii Noroioși Pâclele Mari is the largest mud volcano reserve in Europe, located in the commune of Berca, Buzău County, designated as a protected area covering 26.65 hectares. The phenomenon, which is spectacular and rare on a global scale, is generated by natural gas emissions — mainly methane — originating from the hydrocarbon deposits of the Buzău Subcarpathians. The gases rise through impermeable clay layers and carry cold mud to the surface, forming cones, craters and small pools in continuous activity. The temperature of the expelled mud equals that of the surrounding environment — which is why they are called "cold volcanoes", as opposed to classic magmatic volcanoes. The mud cones reach heights of several metres, and the terrain's morphology changes continuously depending on underground activity and rainfall — after heavy rains, the phenomenon intensifies spectacularly. The resulting landscape is entirely unique: the grey-white soil, cracked and composed of dried clay, is almost completely devoid of vegetation due to high salinity and the toxicity of the gases, creating a landscape frequently compared to the surface of the Moon or a Martian crater. A few halophytic and xerophytic species grow sporadically at the edges of the reserve. The geological substrate belongs to the Subcarpathian Depression of Buzău, which is rich in hydrocarbon deposits. Near Pâclele Mari lies Vulcanii Noroioși Pâclele Mici, at Beciu — a distinct site with similar but more compact morphology. Both are part of the UNESCO Geopark Ținutul Buzăului, recognised in 2022. They are worth visiting in any season, with the most impressive display occurring after rainfall — though care should be taken around the ground gases, which can be irritating on windless days.