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.