Taken from a book purchased at St. Michael's Mount. This shows the "big picture".
The boat ramp can be seen at lower left, with the Causeway clearly visible through the water.
The tidal movement is such that at high tide a boat trip is required to reach the Island,
but as low tide approaches the causeway is exposed and it is possible to walk between the Island and the mainland.
The day we were there, heavy fog came in, making the walk back along the Causeway with water just receeding from the pathway quite an experience.
(St. Michael's Mount - The Illustrated Historical Guide - John St.Aubyn - The National Trust)