Elizabeth City lies near the mouth of the Pasquotank River, where it flows into Albemarle Sound from the north. North of the city is the Dismal Swamp Canal. To the east is the southern segment of the Albemarle and Chesapeake Canal, separated from the Pasquotank River by only a narrow neck of land. Much of the food and forage delivered from North Carolina to southeastern Virginia was transported along these two canals. In particular, Norfolk, Virginia depended upon continued access to the canals for its subsistence. So long as the North Carolina Sounds remained in Confederate hands, Norfolk could be well supplied despite the blockading efforts of the Union Navy at the mouth of the Chesapeake Bay.