Atlantic seaboard watershed

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: 2148 sqmi
 * Gulf of Maine: 69115 sqmi
 * Long Island Sound: 16246 sqmi
 * Lower New York Bay: >14000 sqmi


 * Other notable sub-watersheds:
 * Delaware Bay: 14119 sqmi — larger than several, but not adjacent to either divide
 * Rehoboth Bay
 * Indian River Bay
 * Assawoman Bay
 * Isle of Wight Bay
 * Sinepuxent Bay
 * Chincoteague Bay


 * Chesapeake Bay: 64299 sqmi — adjacent to both divides (at the Triple Divide point)


 * Sub-watersheds adjacent to the Eastern Continental Divide:
 * Albemarle Sound: >14380 sqmi
 * Winyah Bay: >7221 sqmi
 * Santee River: >4531 sqmi
 * Savannah River: 9850 sqmi
 * St. Johns River: 8840 sqmi
 * Biscayne Bay: >2800 sqmi
 * Kissimmee River: 3000 sqmi