The Atlantic seaboard watershed is a watershed of the Atlantic Ocean in eastern North America along the Atlantic Canada (Maritimes) coast south of the Gulf of Saint Lawrence Watershed, and the East Coast of the United States north of the Kissimmee River watershed of Lake Okeechobee basin in the central Florida Peninsula.

The continental area east of the Appalachian Mountains and highlands to the north and south is demarcated on the south by drainage to the Lake Okeechobee basin (which drains both westward to the Gulf and eastward to ocean), the Eastern Continental Divide (ECD) to the west, and the Saint Lawrence divide to the north. US physiographic regions of this watershed are the Atlantic Plain and the Appalachian Mountains & Highlands.

;Sub-watersheds adjacent to the Saint Lawrence divide:

  • Chedabucto Bay:
  • Gulf of Maine: <!--SOURCE: Gulf of Maine WIKIARTICLE-->
  • Long Island Sound: <!--The value is the sum of the watershed values at the Long Island Sound wikiarticle|date=August 2010-->
  • Lower New York Bay: >

;Other notable sub-watersheds<!--IN ADDITION TO THE Chesapeake watershed, INCLUDE ONLY THOSE ARE LARGER THAN THE SMALLEST ADJACENT WATERSHED-->:

  • Delaware Bay: — <small>larger than several, but not adjacent to either divide</small>

:Rehoboth Bay

:Indian River Bay

:Assawoman Bay

:Isle of Wight Bay

:Sinepuxent Bay

:Chincoteague Bay

  • Chesapeake Bay: — <small>adjacent to both divides (at the Triple Divide point)</small>

;Sub-watersheds adjacent to the Eastern Continental Divide:

  • Albemarle Sound: >
  • Winyah Bay: >
  • Santee River: >
  • Savannah River:
  • St. Johns River:
  • Biscayne Bay: >
  • Kissimmee River:

References