Patagonia-Chili and Argentina
Moreno Glacier
"Pressure from the weight of the ice slowly pushes the glacier over the inner fjord of Lake Argentino reaching the coast of Península de Magallanes and bisecting the lake at an area called the Brazo Rico (Rico Arm) on one side and the Canal de los Témpanos (Iceberg Channel-pictured here) on the other. With no outlet, the water level on the Brazo Rico side of the lake can rise by as much as 30 meters above the level of the main body of Argentino Lake. Intermittently, the pressure produced by the height of the dammed water breaks through the ice barrier causing a spectacular rupture, sending a massive outpouring of water from the Brazo Rico section to the main body of Lake Argentino and the Santa Cruz river. As the water exits Brazo Rico, the scored shoreline is exposed, showing evidence of the height of the water build-up. This dam–ice-bridge–rupture cycle recurs naturally between once a year to less than once every decade." (Los Glaciares National Park". whc.unesco.org. UNESCO. Retrieved 21 August 2017)
