Starting from Corfe Castle, the first 25m of the route will loop out to the coastline and back again. From there, its across to Lulworth Cove, past Durdle Door, with ups and downs all the way to the Weymouth halfway point. For 100km challengers - it's past Portland Bill, nature reserves, along the western end of Chesil Beach to West Bay's famous cliffs (of TV's Broadchurch fame) - before a finish line celebration in vibrant Bridport.