The drone is flying over a dam located in St. Petersburg on the shore of the Gulf of Finland of the Baltic Sea. A ring road runs on the dam. Cars are driving fast on the road. This dam is a very important engineering structure that protects St. Petersburg from floods. This is a unique hydrological structure that has no analogues in the world. The waters of the bay are dark. In the background you can see the Gulf of Finland and the city of St. Petersburg on its shore. Aerial.