Dylan's body was found on Thursday on the mud flats at the high tide mark less than half a mile from where he went into the water.

BBC: Dylan Cecil sea fall death: Memorial service in Burnham

High water mark: the highest reach of the water at high tide.

UNESCO: L O S S A R Y

The tide had risen well beyond the high water mark.

NPR: A Hippo and Tortoise Tale

The Tide still were sure to fall short of the three-year high-water mark for the opening round.

NPR: 'Bama Players Go Back-To-Back-To-Back In 1st Round