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Leading lights Maasmond near Hoek van Holland in June 2004. These both black-white lighthouses, standing at the middle pier, mark with their white light the entry into the mouth of river Maas (Maasmond), after them leading lights with red light show the way into the Nieuwe Waterweg (north of middle pier) to the port of Rotterdam (visible in the background) and other leading lights with green light show the entrance into the Europort (south of middle pier).