Dover

Dover was a town in England. It was known for its chalk cliffs.

History
In May 1940, the Tenth Doctor and Donna Noble, near the Dover cliffs in the UK, worked to prevent a Nemonite invasion from derailing a Second World War counterattack called Operation Dynamo. (AUDIO: The Nemonite Invasion)

In 1942, the Third Doctor and Professor Pierre Vedrun tricked Captain Ernst Wolfgang Spiegal into transporting themselves into the inside of a jail cell in a Dover police station. Thirty years later, a police sergeant recalled the incident when the Doctor inquired about it. (COMIC: Timebenders)

On 2 August in the mid-1990s, Pat Unwin went missing from an institution near Dover. (PROSE: The Algebra of Ice)

Other references
The Tenth Doctor voiced that Earth was Dover to the Moon's Calais. (PROSE: I Am a Dalek)