Karen Gambrell of Folkestone said she brought the friendly cat, which she named Brontie, to a local veterinary clinic, where her ID chip was scanned and her place of origin was found to be Denmark, The Copenhagen Post reported Friday.
"I was shocked when I was told where she's from," Gambrell told the Folkestone Herald. "How did Brontie get to Folkestone from so far away?"
The Cats Protection in Hythe, England, said it has not yet been able to match the cat's ID number to an owner.
Rescuers theorized the cat may have stowed away in a van or on a ship to cross the English channel. It may also be the pet of someone who recently moved but had not yet updated the cat's microchip information.