Cachapoal River begun to incise in the rising Andes in the Miocene epoch.

[1] The climate of the valley is temperate and consistently Mediterranean, sheltered by the coastal range from the cooling influences of the Pacific Ocean.

The Rapel Valley produces predominantly red wines, including Carménère, Cabernet Sauvignon, and Merlot.

The valley's diverse microclimates allow the growing of a wide array of grapes; these range from cold-climate varieties at higher altitudes near the Andes, to varieties which need warmer climates in the lower-lying areas surrounding Lake Rapel.

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