Middlesex

Historic county of England

Middlesex is a historic county, a former post county, and a former administrative county in South East England; it is now mainly within the ceremonial county of Greater London, with small sections in neighbouring ceremonial counties. The county's boundaries largely followed three rivers: the Thames in the south, the Lea to the east and the Colne to the west. A line of hills formed the northern boundary with Hertfordshire. The county was the second smallest of the historic counties of England, after Rutland.

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