Mississippi River to flow into Lake Pontchartrain and thence into the Gulf of Mexico . Vasco da Gama Bridge The Vasco da Gama Bridge ( Portuguese : Ponte Vasco da Gama ; pronounced  [ˈpõt(ɨ) ˈvaʃku dɐ ˈɡɐmɐ] ) is a cable-stayed bridge flanked by viaducts and roads that spans the Tagus