The Hilsea Lines are a line of 18th- and 19th-century fortifications built to protect the northern approach to Portsea, an island off the coast of England which is part of the city of Portsmouth and its key naval base. They are now used as a greenspace and leisure area.
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Wikipedia https://en.wikipedia.org/wiki/Hilsea_Lines
Coordinates 50°50'6.76" N -1°4'29.501" E
