The Dismal Swamp is a marshy area in Middlesex County in central New Jersey.

[2] The swamp's geology is part of the Passaic Formation and consists of sedimentary rock composed of red-brown shale.

[3] In the early 1900s a Russian exile settlement, New Petrograd, was established near the swamp near the Metuchen border.

[3] The Triple C Ranch, located within Dismal Swamp, is headquarters to the Edison Wetlands Association.

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