Start from this vantage or any other,
it is all the same
the sea meets the land
the sea is never still
it is always a problem
what is dry land
what is under the sea.

In the days of the monarchs this was solved by them owning everything between the high and low water mark. This might seem trivial but it goes deeper. Even if you decide to wait for the calmest day of the century and take thousands of photographs of every little section of the coastline you still cannot be certain. A bay is always made up of beaches, little rocky coves and outcrops. Each cove and outcrop breaks down into little nooks and gullies which in turn break down into individual rocks and stones and little isolates patches of sea wet sand nobody has ever got to. Each rock and stone is made up of nodules and indentations which in turn out to be millions of molecules all crammed together and these would generate unbelievable distances. A stretch of coastline that appeared to be just a few miles on the average atlas would have a measurement of incalculable miles.