View of the Tagus River from Castelo São Jorge, Lisbon, Portugal

After the stretch where the Tagus forms the border, it enters Portugal, passing by Vila Velha de Abrantes, Entroncamento, and Vila Franca de Xira at the head of the long narrow estuary, which has Lisbon at its mouth. There is the largest bridge across the river, the Vasco da Gama Bridge (in Lisbon) with a total length of 17.2 km. It is also the longest bridge in Europe. The Portuguese regions of Alentejo and Ribatejo take their names from the river. Alentejo, from ("beyond the Tagus"), and Ribatejo, from Arriba-Tejo (on the banks of the Tagus). There is a canal and aqueduct between the Tagus and the river.

 
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