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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. Grid reference SY 685 765. The original harbour was formed by the protection offered by the south coast of England, Chesil Beach and the Isle of Portland. This gave protection from the weather to ships from all directions except the east. King Henry VIII built Portland Castle and Sandsfoot Castle to defend this anchorage. Construction of the modern harbour began in 1849 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 and created a much larger harbour providing protection from south-easterly winds. The Verne Citadel fort, Nothe Fort, East Wear Battery, High Angle Battery 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 attack from the south came in 1914 when HMS Hood was scuttled across the southern entrance to the 1848 breakwater.
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