View towards northwest. The Rio Douro forms the border between Spain (foreground) and Portugal (background). The Saucelle Dam, constructed in the 1950s for hydropower generation, appears near the central bottom of the image.
View towards northwest. The Rio Douro forms the border between Spain (foreground) and Portugal (background). The Saucelle Dam, constructed in the 1950s for hydropower generation, appears near the central bottom of the image.