This image was acquired from
pixabay. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
passenger ship lock gateway sluice wall floodgate planks glass wall window middle deck concrete water lock chamber iron gate derdap djerdap serbia romania dam europe karparten sdkarparten danube current river river cruise cruise danube cruise cruise ship railing mirroring underwater hub meters two stage lock