what is the name of spain's longest river?
Of the five main rivers in Spain, the Tajo, Duero, Guadiana and Guadalquivir all flow southwards and westwards out into the Atlantic ocean, whereas the Ebro has its outlet in Tarragona in the Mediterranean Sea. The River Tajo, also known as the Tagus, is the longest river of the Iberian Peninsula. It starts from the mountains east of Madrid and passes Teruel and Toledo in central Spain, before crossing the Spanish-Portuguese border and flowing out into the sea at Lisbon.