River Glen

The River Glen is an improved river in The Fens of Cambridgeshire, navigable for 12 miles from its junction with Bourne Eau[?] at Tounge 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.