The Tagus and Douro rivers are very important for different reasons.
The biggest river that goes threw Portugal is Tejo, The biggest river born in Portugal is Mondego.
The biggest river in Portugal is the Mondego.
The biggest supplier in Europe and one of the biggest in the world is Portugal.
There is no river in Portugal by that name.
Lisbon [Lisboa] is Portugal's leading seaport. It's the busiest port on the European Atlantic coast. It's located in western Portugal at the point where the Tagus River [Rio Tejo] flows into the Atlantic.
The Tagus is a river in Spain and Portugal. Tua is a river in northeastern Portugal.
James river is NOT the biggest river
Mount Everest is because it is in Portugal
The Douro River runs from Spain through Portugal to the Atlantic Ocean.
The Yarra River is Melbourne's biggest river.
The longest portuguese river that hasn't its source on Portugal is the Tagus, which starts on Spain and goes for 716 km, then 47km as a border between the two countries and finally the remaining 275km are in Portugal. The longest born in Portugal river is the Mondego, which has 234km.
The Tagus River flows west from Spain through Portugal.
Portugal is not a city. Many rivers cross Portugal.