71388318 - Olive trees in troughs, Parc Oliwkowy de la Rouge, Rue du Lacydon, Marseille, Bouches-du-Rhone, Provence-Alpes-Cote d'Azur, France70408254 - Warning sign in front of parabolic troughs, PSA, Plataforma Solar de Almeria, center for the research of solar energy by the DLR, German Aerospace Center, Almeria, Andalusia, Spain70293327 - Cave with troughs for grinding grain, Tadrart Valley, Akakus mountains, Libya, Sahara, North Africa
