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Monte San Valentin, also known as Monte San Clemente, is the highest mountain in Chilean Patagonia and the highest mountain south of 37°S outside Antarctica. It stands at the north end of the North Patagonian Icefield. Monte San Valentin can be climbed from Lago Leones, to the south east, or from Laguna San Rafael, to the west. The ascent is long and is particularly subject to bad weather. The accident and fatality rate is high.