 There is a west-east precipitation gradient from to less than in the region; frontal systems and cyclones within the westerlies deliver most precipitation in the region, but precipitation rates are controlled by orographic precipitation and the rainshadow effect resulting in the west-east gradient.Vegetation in the region ranges from Magellanic subpolar forests to semidesert, depending on the amount of moisture available; "Nothofagus" species form most of the woods, including "Nothofagus antarctica", "Nothofagus betuloides" and "Nothofagus pumilio".Aguilera erupted during the Holocene, depositing tephra in the region of Lago Argentino and Torres del Paine.