Middle Level Navigations
From Graces Guide
The Middle Level Navigations are a network of waterways in England, primarily used for land drainage, which lie in The Fens between the Rivers Nene and Great Ouse, and between the cities of Peterborough and Cambridge. Most of the area through which they run is at or below sea level, and attempts to protect it from inundation have been carried out since 1480.
1630 The Dutch Engineer Cornelius Vermuyden was employed by the Earl of Bedford and others to drain the Fens.
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