The Tagus River does have it source in Spain. Its source is Fuente de Garcia, which is located in the municipality of Frias de Albarracin, Spain. The Tagus River has a length of 645 miles.
Its source is in Spain, its mouth is in Portugal, near Lisbon.
Its source is in Spain.
The source of the Tagus River is in Spain, specifically the region of Castilla-La-Mancha. However, its mouth is in Portugal in the city of Lisbon.
As far as I am familiar, there is no Argus River in Spain. If, perhaps, you meant the Tagus River (Río Tajo in Spanish), the river has its source and most of its length in Spain, but its mouth is in Portugal.
The river Tagus (the Tagus) flows through Spain and has its mouth at Lisbon, Portugal.
It begins in Spain & enters the Atlantic near Lisbon , Portugal.
Lisbon, Portugal.
It rises in the Sierra de Albarracin of Eastern Spain, at a point about 90 miles (150km) from the Mediterranean coast, and flows westward across Spain and Portugal for 626 miles (1007km) to empty into the Atlantic Ocean near Lisbon.
It is not possible for a normal waterway to be higher at the mouth then at the source, otherwise it would flow backwards.
Spain owned the mouth of of the Mississippi river.
Spain owned the mouth of the Mississippi River.
Huelva is in southwest Spain at the mouth of the Guadalquivir River.