amidst mountains, the hydroelectric plant on the tua river

bridge waterway river reservoir transport landmark infrastructure tourism ruins mountain valley fortification arch terrain cliff track dam hydroelectric electricity wall canyon architecture tua mouth nature landscape sky tree lake summer forest hill panorama rock europe water portugal blue douro rural countryside travel mountains altitude natural panoramic plants trees list energy renewable turbines carrazeada ansiapound es back hills alto wine region middle plant for production traiexcl montes