The Patagonian Sea includes an extensive and flat continental shelf (approximately 1,000,000 km2), which rarely exceeds 100 m.
At the edge of the shelf the depth increases to 160-200 m, and thence the slope increases more abruptly, by one metre for every 1,000 m (West to East) on the so-called continental slope.
Beyond the slope is the Argentine Basin, a great abyss, thousands of metres in depth.