from St. Peter's to St. Paul's

The strait is 850 metres (2,790 ft) across at its narrowest point. It joins the upper lake, Lago Chicuito, and the lower (and smaller) lake, Lago Pequeno, or "little lake". The entire lake is called Lake Titicaca and is the largest lake, by volume, in South America. It is situated on the border of Bolivia and Peru.