Silent Pool
From Tardis Wiki, the free Doctor Who reference
The Silent Pool was a lake near the Eddison Manor in England. On 8 December, 1926, Agatha Christie, the Tenth Doctor and Donna Noble drowned the Vespiform Reverend Golightly in this lake. The next day, Agatha's car was found by the side of the lake. (TV: The Unicorn and the Wasp)
Behind the scenes
The name of the lake is not mentioned in-story, but its name is on a sign.
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