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Portland Harbour is located beside the Isle of Portland, off Dorset, on the south coast of England. It is one of the largest man-made harbours in the world.
The original harbour was formed by the protection, from south westerly and northerly weather, offered by the south coast of England, Chesil Beach and the Isle of Portland. Construction of the modern harbour began in the 1848 when the Royal Navy created a breakwater to the south of the anchorage, made of blocks from local quarries on the Isle of Portland. This was completed in 1872. Fortifications including The Verne fort and two forts on the breakwaters were also built.
In 1906, with the threat of torpedo attack from the eastern side of the anchorage, two more breakwaters were added. A further barrier against submarine, from the south, attack came in 1914 when HMS Hood was scuttled across the entrance to the original breakwater.
The harbour is a popular location for wind surfing, sailing and SCUBA.
In addition to the HMS Hood, there are other wrecks around the harbour: