1) European waterway 2) European watercourse 3) European river 4) Portuguese waterway 5) Portuguese river 6) Portuguese watercourse 7) River in Portugal 8) River in Europe 9) Watercourse in Europe 10) Waterway in Europe 11) Watercourse in Portugal 12) Waterway in Portugal 1) International river of Europe 2) Tributary of the Douro River