For boats that is.
These are the remains of Mersey Flats, a type of double bowed barges firmly used on the River Mersey for transporting goods.
There have always been a few bits sticking up out of the mud at low tide.
However the creation of three islands mid stream for the legs of the new Mersey Gateway Bridge, has greatly affected the flow of the river.
In some parts it is dumping huge piles of mud and silt, elsewhere it is scouring out massive areas of its banks.
Here it is cutting a long way back in shore and has uncovered, what looks like a very old graveyard for a large number of redundant Mersey Flats.
They were normally made of Oak and Pitched Pine, and in common use between the 1730s till around the 1890s.
