Lake Maggiore (in Italian: Lago Maggiore) is the most westerly of the three large prealpine lakes of Italy and the second largest after Lake Garda. It has a surface area of about 213 km2, a maximum length of 54 km and, at its widest, is 12 km. Its main tributaries are the Ticino, the Maggia, the Toce (by which it receives the outflow of Lake Orta) and the Tresa (which is the sole emissary of Lake Lugano). The rivers Verzasca, Giona, and Cannobino also flow into the lake. Its outlet is the Ticino which, in turn, joins the river Po just south-east of Pavia.