Paso de los Libertadores in the Andes Mountains between Chile and Argentina: the pass reaches 10,521' and is famous for Los Caracoles (The Snails) switchbacks on the Chilean side. Commercial trucking over the pass is heavy and the wait for autos and buses at the Argentine and Chilean Customs can be very long! Aconcagua Provincial Park and the major climbing routes to Aconcagua summit are reached off the pass in Argentina, near the border with Chile.