The Old Bedford and New Bedford Rivers are two man-made bypass channels linking Denver and Earith. The New Bedford River is tidal and navigable by those who find its extreme boringness novel enough to warrant exploration. It's also much quicker than taking the Great Ouse route.
Anyway, the gap between the two channels (known as the Hundred Foot or Ouse Washes) is used in times of flood for water storage. As you can see from this map, there are normally dry-ish fields (actually a lot of it it wetland) between them:
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But when I crossed them in the train at the weekend this was what I saw:
Yes, those are trees!
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