The River Glen reference article from the English Wikipedia on 24-Jul-2004
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River Glen

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The River Glen is an improved river in The Fens of Cambridgeshire, navigable for 12 miles from its junction with Bourne Eau at Tongue End, via Pinchbeck and Surfleet to the tidal entrance sluice to the River Welland, navigable only when the tidal level is the same as the river level.

See also