On day 5, Pete and I had the pleasure of walking without our rucksacks as we did a circular route around the Isle of Portland.  As you can see from the map (pic 22), the ‘Isle’ is not really an island, because it’s connected to the mainland by a causeway, created by a rather incredible coastal formation called Chesil Beach.  The beach is 18 miles (or 29 km) long and is up to 50 ft (15m) high and 220 yards (200m) wide in places.  It’s made up of shingle or pebbles, which increase in size from north west to south east.   Behind the beach is a shallow tidal lagoon, called the Fleet.