Iterations of the wrack line

There are many references to the wrack line. Where there is a tide, there is a wrack line. Here is one from South Asia

Walking the Wrack Line is by essayist Barbara Hurd. The publisher, The University Of Georgia writes
" Each chapter starts with close attention to an object-a shell fragment of a pelican egg, or perhaps a jellyfish-but then widens into larger concerns: the persistence of habits, desire, disappointments, the lie of the perfectly preserved, the pleasures of aversions, transformations, and a phenomenon from physics known as the strange attractor."

Scientists often check for turtle nests along the wrack line.

Canadian scientists study the wrack line on cobble beaches.