Grzegorz Gawlik on different continents and in different climates. Among other things, he discovered the highest lakes in the world on the Ojos del Salado volcano and found that the highest active volcano in the world is Llullaillaco. In addition, he explored more than 100 other volcanic sites such as geyser fields, geothermal fields, volcanic caves, volcanic deserts, volcanic plateaus, volcanic craters and cones, volcanic rock formations, lava fields. He climbed to about 100 peaks 4-, 5-, 6- and 7-thousand meters in the Himalayas, Andes, Pamir, Caucasus, Cordillera, High Atlas, Tanzania, Borneo and hundreds of lower peaks. During the expeditions, Gawlik explored
Hagen Mountains Hagen Mountains The Hagen Mountains () are a subrange of the Berchtesgaden Alps. They lie mainly in the Austrian state of Salzburg, the western quarter is in the Bavarian county of Berchtesgadener Land. The steep western flanks of the Hagen lie in Bavaria and drop in height to the basin of the Berchtesgadener Königssee. The mountain range has an area of about 12 kilometres by 10 kilometres. Its highest peaks are located at its perimeter, its interior peaks being slightly lower. The two highest summits are the Großes Teufelshorn () south of the Röth and Kahlersberg (). The Hagen mountains