not sure how to word this but will try.   When I docked in Lindenhurst in the 70s I used to look at tide charts for the two inlets but primarily Fire Is.   Usually went to Snakehill so I looked up Fire Is Inlet tides.   When I moved the boat in the 80s to Amityville I switched to fishing West Island and Sloop Channel so would look up Jones Inlet tides and continued to do so when I started trailering out of Massapequa in 97 or so.  Now I just kayak locally and look up Amityville high tide times, but I know the incoming continues to flow through 'Pequa beyond that time.  (Yes, I know the charts all say times approximate!)   BUT WHERE ALONG THE SOUTH SHORE (BACKBAY) DOES ONE SEE THE "end" ?   Bergen Point ?   or is Bergen Pt only impacted by Fire Island Inlet tide ?  Tanner Park, Copaigue ?