The river Tejo (Portuguese) or Tajo (Spanish) gathers his waters in Spain and runs from somewhere around Madrid to Portugal and into the Atlantic ocean close to Lisboa. It is the longest river on the Iberian peninsula.
Close to Lisboa the Tejo forms a wide stream that must have been very useful for the seafarer nation. In Lisboa you are always close to the Tejo and you can walk along at its shore at the Praça do Comércio or the Cais de Sodré. The Torre de Belém is standing in the waters of the Tejo and the Ponte Vasco da Gama is the biggest bridge crossing it.