Here we see an aerial shot of the British Mulberry port at Arromanches. The scale of the construction is shown by the size of the Liberty ships in the bottom-right of the picture.
The picture has six numbered features
1: The two long floating piers in the centre of the picture, each nearly three-quarters of a mile long
2: A shorter pier for barges (top right)
3: Main spud pier for coasters and medium sized ships (at the end of the piers in 1)
4: 'Gooseberry' blockship (bottom left)
5: 'Phoenix' concrete caissons making a break-water (some centre bottom, some bottom right)
6: Mooring for Liberty ships (bottom right, just above a line of 'Phoenix' break-waters.