| Atlantic Seaboard | |
| Type: | Watershed |
| Map Size: | 330px |
| Location: | Canada and the United States |
| Area Total Sq Mi: | 277,000 |
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.
2148sqmi[1]
69115sqmi
16246sqmi
>14000sqmi
14119sqmi — larger than several, but not adjacent to either divide
64299sqmi — adjacent to both divides (at the Triple Divide point)
>14380sqmi[2]
>7221sqmi[3]
>4531sqmi[4]
9850sqmi
8840sqmi
>2800sqmi
3000sqmi