Which body of water does the Vasco de Gama Bridge span?

The Vasco da Gama Bridge is a cable-stayed bridge flanked by viaducts that spans the Tagus River in Lisbon, the capital of Portugal. It was built to alleviate the congestion on Lisbon's 25 de Abril Bridge, and eliminate the need for traffic between the country's northern and southern regions to pass through the capital city.

The bridge carries six road lanes, with a speed limit of 120 km/h (75 mph), the same as that on motorways, except on one section which is limited to 100 km/h (60 mph). On windy, rainy, and foggy days, the speed limit is reduced to 90 km/h (56 mph).

The Tagus is the longest river in the Iberian Peninsula. The main cities the rivers passes through consecutively are Aranjuez, Toledo and Talavera de la Reina in Spain, and Abrantes, Santarém, Almada and Lisbon in Portugal. The river flows 716 km (445 mi) in Spain, 47 km (29 mi) along the two countries' border and 275 km (171 mi) in Portugal.