The River Po is followed from its source to the territories of Venice and Ferrara in this sequence of antique maps by Père Placide de Sainte-Hélène, the French Augustinian friar and royal geographer who lived from 1648 to 1734, issued in the year of his death. Piedmont and Montferrat form the western section, and Milanese lands, Mantua, Parma and Modena appear downstream. The source sheet also marks the routes between France and Piedmont across the mountains, and the maps divide the river corridor among the duchies and states of their day.