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England Coast-to-Coast, 190 miles long, traverses the northern part of England from west to east, at a more narrow section, just below the Scottish border. Simply collect a pebble (a small one!) from the quaint village of St Bees on the Irish Sea facing the Isle of Man. Put the pebble in your rucksack, and proceed to walk through three national parks including the Lake District, Yorkshire Dales, and North York Moors. Drop the Irish Sea pebble into the North Sea at Robin Hood's Bay. Done.