Due to the cold weather the Wadden Sea got so frozen that we were able to walk on it. The Wadden Sea is made up of fairly shallow parts and tidal flats. At -4 the salt water start freezing and because we had so many days with maximum temperatures of below that they organized some scenic walks across it. More info on the Wadden Sea can be found here.
I took this during one of those scenic walking tours on the Wadden Sea near Pieterburen, The Netherlands.