koblenz, germany - 08 10 2021: flooded ricker lock with sluice gates

water sea shore reflection wave winter coast ocean vehicle pier river snow dock bay beach boat morning lake ice koblenz germany 2021: big passenger ship narrow mosel lock city rhine small marks north unesco world heritage mittelrheintal deutsches eck estuary 2000 years history name confluentes roman times writing coblenz centuries flooded ricker sluice gates