The river is "the deeper trace of the old Lusitanian landscape, shedding its tears into the sea ", the region where "the mountains had been reached by staircases of socalcos in whose plain terraces the land was kept". Teixeira de Pascoais

All this work made by a "race of giants that raised the most beautiful and painful monument to the work of the Portuguese people". Jaime Cortesão

"…it is on the map of the humbleness with which we were endowed, the sole incommensurable evidence with which we can amaze the world". Miguel Torga