Castles & palaces
Royal Military Canal
Defensive canal in southern England
Wikipedia names Royal Military Canal 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 Royal Military Canal. Each title’s page links to the sentence that says so.
Filming locations nearby
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Towns & cities
Rye
England · 3 km south-west
Town in East Sussex, England
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Towns & cities
Rye Harbour
England · 4 km south
Village in East Sussex, United Kingdom
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Towns & cities
Fairfield
England · 4 km north-east
Village in Kent, England, UK
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Towns & cities Camber
England · 5 km south-east
Village in East Sussex, England, UK
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Landmarks & buildings
Camber Sands
England · 6 km south-east
Beach at the village of Camber, Kent near Rye, East Sussex, England
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Towns & cities
Appledore
England · 6 km north
Village and civil parish in the Ashford District of Kent, England