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Briarcliff Woods is a dense tangle of forest that aprons Briarcliff Manor. The little known tunnel, once known in the manor's days as a tuberculosis ward as the "death chute" for its purpose in the mass removal of the quickly dying patients, opens into the thick of these woods. This is where Sr. Mary Eunice goes to feed the inmates altered by Dr. Arden's cruel experiments.
The Briarcliff woods showed to be very thick with trees, and bushes. This suggests that the Asylum is secluded, and is a fair distance away from Boston.