On the rio di San Trovaso (a Venetian canal), in the old parish of Santi Gervasio e Protasio, the Ponte delle Maravegie — brick, iron bands in Gothic arches on little Istrian-stone columns and three coats of arms carved on its side — joins the Fondamenta Toffetti to the Priuli, in a still-quiet, working-class Dorsoduro.