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
Breifne Mountains The following table lists the 10 highest major mountain peaks of the Breifne Mountains, all with a topographic elevation of at least 411 metres (1,348 ft). Other hills include: Breifne Mountains The Breifne Mountains (), is a range of hills and mountains in counties Cavan, Fermanagh and Leitrim, Ireland. They are within a region historically known as Bréifne. The range has two sub-ranges: the southern Iron Mountains that span across Leitrim and Cavan, and the northern Cuilcagh Mountains that straddle Cavan and Fermanagh. The highest peak is Cuilcagh at , which is the highest peak in both Cavan and Fermanagh,