The Cordillera Sarmiento is a mountain range located in the Chilean Patagonia to the west of Puerto Natales named after Pedro Sarmiento de Gamboa, who was a Spanish explorer who navigated the region's waterways between 1579 and 1580. It extends in north–south direction on the western shore of the Fjord of the Mountains and parallel to the Cordillera Riesco. The highest mountain in this range is La Dama Blanca (The White Lady), with an elevation of 1,941 m (6,368 feet), which is located at . It is a subrange of the Andes and has a number of small glaciers. Geography A natural continuation of the Southern Patagonian Ice Field, Cordillera de Sarmiento is a mountainous peninsula about long and wide. The range centers about the 52° South line of latitude, west of Puerto Natales. The main summits of the range are La Dama Blanca (), followed to the south by Cerro Trono () and Alas de Ángel (). Three more summits rise over , and many of the peaks are ice-covered towers or sharp rock spires, flanked by vertical walls. On the official maps of the Chilean IGM (Instituto Geográfico Militar), not a single feature of the Cordillera de Sarmiento has been given a name, in part due to the total lack of human presence in the area. Nevertheless, over the years, explorers and climbers have named the summits, lakes, glaciers, and rivers. With nearly of jagged relief, the cordillera has a profile somewhat similar to the French Alps, but its glaciation is much more extensive, sending large glacier snouts into tidewater. In recent geological times the ice was thousands of feet thicker, bulldozing the long north–south fjords, rounding out basins in the main massif, and shaving smooth the neighboring ranges. From the nearby sub-Antarctic waters, the persistent west winds (the Furious Fifties) pick up moist, cold air and plaster the peaks with thick frost. This forms the infamous "cauliflower ice", similar to the rime that forms on peaks bordering the Patagonian Ice Cap, farther north, but much denser and more persistent. Nearly all ascents, to date, have been on snow and ice. The rock, part of the rare Rocas Verdes formation, originated at the end of the Gondwana super-continent, when Patagonia started to break up and an oceanic basin was formed between the volcanic arc and the continent. The basin filled with large extrusions of basalts, sandstones, shales, and