the hydroelectric dam over the river

bridge waterway reservoir river infrastructure transport terrain mountain track cliff coast highway fortification ruins canal valley sea dam river-tua foz-tua mountain electricity hydroelectric river nature landscape fluvial sky green tree perspective lake summer forest mount valley panorama rock europe tourism dusk navigate water portugal blue douro rural countryside travel mountains altitude natural scenic plants trees list energy renewable turbines carrazeada-de-ansiães trás-os-montes alto-douro-vineyard bragança douro-river