Landscapes & nature
River Colne
River in Hertfordshire, England
Wikipedia names River Colne as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in River Colne. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Staines-upon-Thames
England · under 1 km
Riverside town on the River Thames in the borough of Spelthorne in Surrey, England
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Landmarks & buildings
Penton Hook Lock
England · 2 km south-east
Lock on the River Thames in Surrey, England
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Towns & cities
Egham
England · 2 km west
Town in the borough of Runnymede in Surrey, England
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Castles & palaces
Great Fosters
England · 3 km south-west
Grade I listed country house in Egham, Surrey, England, UK
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Landscapes & nature
Thorpe Park
England · 3 km south
Amusement park in Thorpe, Surrey, England
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Towns & cities
Thorpe
England · 3 km south-west
Village in the borough of Runnymede, Surrey, United Kingdom