Originally, seventeen sectors along the Normandy coastline had been selected as possible invasion sites and each were provided with a code name taken from one of the spelling alphabets of the time. The coast was divided between Able, west of Omaha, to Rodger on the eastern flank of the invasion area. Eight further sectors were added when the planned invasion was extended to include Utah. Each sector was further subdivided into beaches identified by the colours Green, Red, and White. Gold did not refer to a particular beach but to a landing area. It was delineated by Port-en-Bessin on the west and La Rivière on the east, and included Arromanches, location of one of the artificial Mulberry harbours that were to be constructed shortly after the invasion. High cliffs at the western end of the zone meant that the landings would be undertaken on the flat beach between Le Hamel and La Rivière, in the sectors code-named Jig and King. The area immediately behind the beach was marshy, with open ground and bocage (small fields surrounded by hedges and embankments) further inland. Roads led to the south via Asnelles and Ver-sur-Mer. The terrain to the south-east rose to a ridge at Meuvaines, where on D-Day were located machine gun nests of the German 726th Regiment.