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el_presidente
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The ancient northern Thames is an explanation for the Colne Valley,
the river Colne being the western boundary of Middlesex with Berkshire and Buckinghamshire.
It's readily apparent that the current Colne could not possibly have carved that wide valley,
separating Harefield from the Chilterns, and left the prodigious quantities of gravels,
now evident from the lakes in former gravel pits.