Haisborough sands and Hammonds Knoll Goodwin Sands off Deal, Kent. 5 miles off coast. Devils Sea, South of Japan. Sable Island, NS. has various offshore sandbars. If a vessel is caught it is virtualy finished.
Sand tends to build up between sea and ship.
The movement of the sand has been known to raise sunken ships. There are over 300 wrecks at this locale. This location not dangerous because of rough waters but because the Canadian Military dumped about 900 tons of unwanted bombs just after WW2 finished. McNabs Island at Eastern Canada is a graveyard of rotting ships and a naval storage area. The South China Sea is often a dangerous place.