Beware of the waves!
Introduction
The photograph on this page of Beware of the waves! by Rossographer as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk

Image: © Rossographer Taken: 26 Nov 2007
Signs like these have been erected all along Belfast Lough, warning of the effects of unexpected waves. Most of these have been caused by high-speed ferry services operating out of Belfast such as the Stena Voyager HSS - see Image and Image The Wikipedia article on the HSS vessels also includes some information on such wave incidents at http://en.wikipedia.org/wiki/High-speed_Sea_Service#Incidents