On the north-western coast of Germany is a place like Mont S.Michel in France. The tide goes up and down twice in a day. I went one day in winter. The city i visited is called Husum and it is a little harbor on the coast. The winter was very cold and so ice had covered the water so far you could look at! The photo shows a boat in the harbor and the low tide which has left only white ice on the ground of the sea. The lights on the walls of the houses make the rest!