Geography
Orford Ness is Europe's largest vegetated shingle spit. It is approximately 10 miles (16 km) long, and the site covers a total area of approximately 2,230 acres (900 ha). Forty percent of this (890 acres) is shingle, 25 percent (556 acres) tidal rivers, mud flats, sand flats, and lagoons, eighteen percent (400 acres) grassland, and fifteen percent (330 acres) salt marsh.
The spit formed almost entirely of flint deposited by waves through the process of long-shore drift. The main influence on its formation has been storm waves throwing shingle over the top of the beach crest, where it is protected from ordinary wave action. Over time, this process leads to the formation of stable ridges of fine particles, and swails of coarser shingle.
The size and shape of the spit fluctuates over time (see map). Estimated growth rates range from 64m per year in 1962 to 1967, to 183m per year in 1804 to 1812. Between 1812 and 1821, the total length fluctuated by 1.8 miles (2.9 km). As a result of the dynamically changing nature of the spit, the true age of its formation is unknown. However, before about 1200, Orford is thought to have been a port facing the open sea.
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