Course
The Choptank River begins at Choptank Mills, Delaware, where Tidy Island Creek and Culbreth Marsh Ditch join together. It ends at the Chesapeake Bay in a very wide mouth between Blackwalnut Point on Tilghman Island, and Cook Point, near Hudson, Maryland. Tidy Island Creek and Culbreth Marsh Ditch rise in western Kent County, Delaware. The entire watershed is in the coastal plain. The Choptank reaches sea level near Denton, Maryland and is not salty until around 2 miles (3.2 km) below Denton. Greensboro, Maryland, about 6 miles (9.7 km) up the river from Denton, is the head of navigation.
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