What is the topography of Patagonian region?
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Patagonia, except for the far southern plains, the sub-Andean region, and the Andes, is a vast, wind-swept semiarid plateau, sloping gently toward the east and terminating in cliffs along the Atlantic Ocean. Crossing from the Andes to the Atlantic are transverse valleys, some cradling rivers. Although most of the water courses are intermittently dry, some rivers (the Río Negro, the Chubut, the Santa Cruz, and the Gallegos) are perennial. The sub-Andean region in the west contains numerous lakes (Nahuel Huapí, Buenos Aires, Viedma, and Argentino) fed by glaciers; it also has some deep, fertile valleys. Subantarctic conditions prevail in the far south.
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