Glaciar Perito Moreno, Parque Nacional Los Glaciares, ArgentinaGlaciar Perito Moreno is an approximately 30km long ice tongue which descends eastward from the Southern Patagonian Icefield. It terminates in a calving front, in Lage Argentino, about 4km wide. The glacier has repeatedly advanced towards a peninsula where it forms an ice dam blocking off the southern part of the lake, Brazo Rico. This ice dammed lake may rise up to 30 metres until it ruptures. Lake outbursts were observed in March 2006, in 2004, 1988, 1984, 1980, 1977, 1975, 1972, 1970, 1966, 1963, 1960, 1956, 1953, 1952, 1947, 1940, 1934 and 1917. | |||
 Satellite image of the glacial lakes and the Southern Patagonian Icefield (black: border CL-AR). TERRA, MODIS 28.3.2003 |  Tele photo from ISS (ISS010-E-18312) 19.2.2005. Water in Brazo Rico is turbid due to higher sediment content than in Lago Argentino. |  Looking out from southern beech forest (Nothofagus) towards the southern section of the calving front. |  The height of the ice cliff above the water is 50 to 70 metres, but much more underwater. |
 Calving event into Brazo Rico. |  Bare terrain which gets covered by the ice during advances. Ice dam in the background. |  Ice dam from the North, Brazo Rico in the background. |  The ice dam is in place again but water still flows through a tunnel under the ice. |
 Tunnel exit and strong meltwater outflow. |  Channel between the peninsula and Glaciar Perito Moreno. |  Calving and waves could pose a danger to tourists. |  Viewing terrace opposite the glacier. |
 Icebergs between the peninsula and the glacier. |  Northern part of the cliff; foreground: Notro bushes in bloom. |  Further up the glacier ice velocities of 1 metre per day were measured. |  Calving of icebergs into Lago Argentino. |
 Enlarged section of the previous photo. |  Deep blue, almost debris-free glacier ice and crevasses. | ||
| Photos after Nr. 3: Jürg Alean, December 2004 | |||