Portholme (or Port Holme on Ordnance Survey mapping)[2] is a 106-hectare (260-acre) biological Site of Special Scientific Interest in the Parish of Brampton between Huntingdon and Godmanchester in Cambridgeshire, England.

[4] ...to my father, poor man, and walked with him up and down the house — it raining a little, and the waters all over Portholme and the meadows, so as no pleasure abroad.

In 1910, James Radley, an early aviation pioneer based in Bedford believed that the flat areas of the Portholme Meadow, shielded from winds, and accessible to local towns, were ideal for take-off and landing as well as demonstrating to an enthused public the wonder of flight.

Having acquired a Beleriot monoplane, on 19 April 1910, with almost the whole population of Huntingdon, Godmanchester, and Brampton watching, Radley took off and flew circuits of the meadow to the amazement of the local crowds.

[7] For clarification the feature is commonly mapped geographically, with two words: Port, and "Holme" meaning island.