Lago O'Higgins / Lago San Martín is one of Patagonia's most extraordinary and remote fishing destinations, straddling the border between Chile and Argentina in the heart of the southern Andes. Known as Lago O'Higgins on the Chilean side and Lago San Martín on the Argentine side, this glacially carved lake sits at an elevation of 250 metres (820 ft) above sea level and holds the remarkable distinction of being the deepest lake in the Americas, with a maximum depth of 836 metres (2,743 ft) near the O'Higgins Glacier. Its characteristic milky, light-blue color — the result of glacial rock flour suspended in the water column — is immediately striking and unlike virtually any other fishing water in the world. With a surface area of 1,013 square kilometres and a shoreline stretching 525 kilometres, this is a vast, wild, and largely untouched wilderness lake that rewards anglers willing to make the journey.