serene lake amidst rolling hills under clear blue sky

dam structure day trip spot engineering marvel environmental conservation guarda hydroelectric power idyllic setting leisure area natural reserve water management wide angle view biodiversity blue sky clear weather ecosystem flora freshness greenery habitat hills horizon infrastructure lake landmark landscape lush foliage nature open space outdoor adventure panoramic peacefulness porgugal recreation reflection remote location reservoir rural scene scenic beauty serenity summer sunlight tourism destination tranquility travel viewpoint vista body wilderness serene rolling tranquil nestled vast portugal