Ducks' Trails!

In very light-polluted cities such as Tehran, most of the bright stars of the night sky are very dim. Artificial lights impact the life of habitats of the whole region around the metropolis by the light pollution which can be visible 300 km far away from there! In this panorama-blended shot, some strange traces are obvious on the artificial lake named Chitgar in Tehran, Iran. Those belong to the white ducks that swimming around and reflect the light of light bulbs near there! I think at that time which I took this photo, they had to sleep!

Camera: Nikon D7200
Lens: 18-140 mm at 18 mm
ISO: 100
Aperture: f/5.6
Expo: 30"

Adobe Photoshop
Panorama and Blend of 4 horizontal and 6 vertical shots.