Single sheet. Col. ms. Scale: 1:200 000 (bar). Cartographic Note: Scale in miles. Additional Places: Virginia, North Carolina. Contents Note: Shows the Great Dismal Swamp Canal, linking Chesapeake Bay in the north with Albemarle Sound in the south.
The sketch is accompanied by a page of text, 'Questions and answers on the Swamp. Answers to Col. Hamilton's questions respecting the Great Dismal Swamp', concerning its length and breadth, the growth of timber, extent of cultivation, canal cutting, seasonal factors and whether any animals are peculiar to the Swamp.