December
Slowly but unstoppable move the ice masses of the Perito Moreno towards the banks of the Brazo Rico, a branch of the Largo Argentino, and block the outlet of this part of the lake. While on the eastern side the water can still drain through the Largo Argentino, the precipitation of the surrounding mountains swell on the opposite side. If the water masses don‘t find a way through the blockage in the following months, the pressure on this wall of ice becomes too much and it will burst in a thundering roar. Then the water pours out in a mighty flood into the Largo Argentino.


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