Crews were called to the reserve, on Natures Way, Hampton, on Tuesday (August 25) at 3.48pm.
Cambridgeshire Fire and Rescue Service said crews responded from Dogsthorpe, Yaxley, Stanground, Huntingdon, March, Chatteris, Gamlingay, St Neots and Peterborough Volunteer Fire Brigade, along with a specialist 4x4 vehicle.
The service said teams were assisted by a farmer, who supplied a water bowser, to tackle the fire, which affected grass and trees in the reserve.
Motorists were also warned about smoke on the near-by Fletton Parkway.
A spokesperson for Cambridgeshire Fire and Rescue said the fire was under control by 7.30pm.
Peterborough Telegraph reader Geoff Dixon sent us these pictures of the incident.
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