The line of the Roman fortification that the route traces includes ancient forts, modern towns, nature reserves and coastline: four Roman forts built in the fourth century lie along the route, at Reculver, Richborough, Dover and Lympne. At Seasalter there is an internationally important area for geese, ducks, and waders. The diversity of scenery along the route includes the wide expanses of marshland bordering the Thames and Medway estuaries, the White cliffs of Dover, and panoramic views over Romney Marsh from the escarpment that marks the ancient coastline between Folkestone and Rye.