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“The Tunguska Basin was a river bed in the Tunguska province of Russia. In 1908, the Tunguska...Tunguska Basin
“Siberia was a location in Russia. In 1903, the First Doctor, Ian Chesterton, Barbara Wright and...Siberia
“Zarechny was a village in Siberia, Russia. Ian Chesterton met Grigori Rasputin nearby in 1903...Zarechny
“Red Square was a city square in Moscow, Russia. On 7 November 1967, the Seventh Doctor, Ace...Red Square
“The Great Divide was a time rift created by the Tunguska Event. It connected two periods on...Great Divide (Birthright)