Eastern Continental Divide

The Eastern Continental Divide, also called the Eastern Divide or Appalachian Divide, is an important line in eastern North America. It helps decide where water will flow. On one side, water runs toward the Atlantic Seaboard, and on the other side, it flows toward the Gulf of Mexico. This divide is one of six main lines in North America that separate different areas where water collects.

This divide stretches almost the whole length of the United States, starting near the south of Lake Ontario and going all the way down to the tip of the Florida peninsula. It is made up of higher land, like the Appalachian Mountains in the northern part, and lower ridges in places such as the Piedmont Plateau and the Atlantic Coastal Plain farther south.

Course

The Eastern Continental Divide is a natural line that helps decide where water flows in eastern North America. It separates water that flows east towards the Atlantic Ocean from water that flows west towards the Gulf of Mexico.

In the northern part, the divide runs through the Appalachian Mountains. Water on the west side flows into rivers like the Allegheny, Monongahela, and New River, which all join the Ohio River. Water on the east side flows into rivers like the Susquehanna, Potomac, and James River, which empty into the Chesapeake Bay and then the Atlantic Ocean.

In the central part, the divide follows the Blue Ridge Mountains. Water to the west flows into the New River and Tennessee River, while water to the east flows into the Roanoke, Pee Dee, and Santee Rivers.

In the southern part, the divide moves through the lowlands of Georgia and Florida. West-side water flows into rivers like the Apalachicola, Suwannee, Withlacoochee, and Peace River, all reaching the Gulf of Mexico. East-side water flows into rivers like the Savannah, Altamaha, Satilla, St. Marys, and St. Johns.

Weather

The Eastern Continental Divide is often at the highest points of land. This makes air rise. When air rises, it cools and brings more rain or snow than nearby areas. That is why the divide usually gets more rain and, in winter, more snow than the areas around it.

History

Before about 1760, the Appalachian Divide was the border between lands ruled by the British and the French in North America. The Royal Proclamation of 1763 used this divide as a line to separate the settled areas of the Thirteen Colonies from lands for Indigenous peoples.

The exact path of the Eastern Continental Divide changes over time because of natural processes and human building projects.

Locations

ECD points

Location	State	Coordinates	Summit or other feature
Eastern Triple Divide	Pennsylvania	2,523 feet (769 m)	Triple Divide Peak, Ulysses Township, Potter County
I-80
Babcock Ridge
Allegheny Mountain		2,167 feet (661 m)	summit near Allegheny/Gallitzin Tunnels
		2,690 feet (820 m)	summit above Allegheny Mountain Tunnel (Pennsylvania Turnpike)
		2,460 feet (750 m)	summit above Sand Patch Tunnel
Savage Mountain		2,392 feet (729 m)	railroad cut on Great Allegheny Passage
	Pennsylvania/Maryland	2,840 feet (870 m)	highest summit of the Mason–Dixon Line
I-68	Maryland	2,620 feet (800 m)	crossing near Green Lantern Road
Savage Mountain		2,600 feet (790 m)	saddle point at planned route of 1828 C&O Canal
Backbone Mountain	Maryland/West Virginia	3,380 feet (1,030 m) (highest point)	Headwaters of Potomac River (Maryland's southern border) and Youghiogheny River
US 33 / WV 55	West Virginia	3,295 feet (1,004 m)	Saddle Point at Pendleton County and Randolph County.
I-64		2,460 feet (750 m)	Midland Trail: planned crossing for the 19th century James River and Kanawha Turnpike
Jefferson National Forest	Virginia	3,620 feet (1,100 m)	saddle point at Johns Creek headwaters (James River tributary), and near triple point of Mississippi River (W) & Chesapeake Bay (NE)/Albemarle Sound (Roanoke River) (SE)
Appalachian Trail		3,397 feet (1,035 m)	Parallel Route Begin
Blacksburg, Virginia		2,080 feet (630 m)
Appalachian Trail		3,224 feet (983 m)	Parallel Route Begin
I-81		2,180 feet (660 m)	crossing
Christiansburg, Virginia		2,180 feet (660 m)	2940 Riner Rd, Christiansburg, VA 24073
I-77		2,860 feet (870 m)	crossing
US 21 / Blue Ridge Parkway	North Carolina	2,692 feet (821 m)	crossing at Roaring Gap, NC
Thurmond Chatham Wildlife Management Area			triple point of New River and Yadkin/West Prong Roaring rivers
US 321 at Blowing Rock, North Carolina		3,620 feet (1,100 m)	crossing at the Green Park Inn
NC 105		4,020 feet (1,230 m)	crossing
NC 226 and Blue Ridge Parkway		2,820 feet (860 m)	crossing
I-40		2,786 feet (849 m)	crossing
US 74A		2,880 feet (880 m)	crossing
I-26		2,130 feet (650 m)	crossing
US 276		2,910 feet (890 m)	crossing
US 178		2,694 feet (821 m)	crossing, approx. 1 mile north of NC/SC border
French Broad watershed	North Carolina–South Carolina		tributary of the Tennessee River along NC/SC border dividing mountain ridges running southeast meets Santee watershed flowing into Atlantic
Sassafras Mountain		3,564 feet (1,086 m)	located along the South Carolina-North Carolina border in northern Pickens County, South Carolina, and southern Transylvania County, North Carolina, nearest to the town of Rosman, North Carolina
US 64	North Carolina	2,694 feet (821 m)	crossing
Savannah watershed	North Carolina–South Carolina		across the border of Pickens County, South Carolina & Greenville County, South Carolina, up into Transylvania County, North Carolina, Jackson County, North Carolina, and Macon County, North Carolina, to dividing mountain ridges to Tennessee River tributaries
NC 107	North Carolina	3,868 feet (1,179 m)	crossing
Cowee Gap		4,199 feet (1,280 m)	divides Tennessee (Cullasaja) and Savannah (Chatooga) rivers
Highlands, North Carolina		4,100 feet (1,200 m)	Sunset Rock
NC 28		3,771 feet (1,149 m)	crossing
Black Rock Mountain State Park	Georgia	3,640 feet (1,110 m)	a Blue Ridge summit
ACF River Basin at Young Lick		3,809 feet (1,161 m)	triple point at intersection of 3 GA counties: Hiwassee (Towns Co)/Chattahoochee River (Habersham Co) on the west & on the east: Savannah River (Rabun Co)
Altamaha watershed			triple point along border of Hall & Banks (GA) counties: Chattahoochee River-Banks (west) & Altamaha River-Hall/Savannah River-Banks (east)
Suwanee watershed			triple point: Chattahoochee River/Suwanee Creek (west) & Altamaha River (east)
I-85		1,280 feet (390 m)	crossing (1 of 5)
I-85		1,120 feet (340 m)	crossing (2 of 5)
Norcross, Georgia		1,086 feet (331 m)	through Norcross historic district
I-85		1,050 feet (320 m)	crossing (3 of 5)
I-285		1,020 feet (310 m)	crossing (1 of 2)
Atlanta			near Dekalb Av
I-75 / I-85		1,020 feet (310 m)	crossing (1 of 4 crossings of I-75/4 of 5 crossings of I-85)
I-20		1,050 feet (320 m)	crossing
I-85		1,000 feet (300 m)	crossing (5 of 5)
I-75		976 feet (297 m)	crossing (2 of 4)
I-285		960 feet (290 m)	crossing (2 of 2)
I-75		927 feet (283 m)	crossing (3 of 4)
Atlantic Seaboard fall line			near Macon, Georgia, this intersection is a triple physiographic point of the Piedmont (to the north) and the Gulf & Atlantic coastal plains (southwest & southeast).
I-75		410 feet (120 m)	crossing (4 of 4)
Satilla watershed			triple point: Suwannee (west) & Altamaha River/Satilla River (east)
St. Marys watershed			triple point: Suwannee (west) & Satilla River/St. Marys River (east)
St. Johns watershed	Florida		triple point: Suwannee (west) & St. Marys River/St. Johns River (east)
I-10		159 feet (48 m)	crossing
Florida Trail			Central Florida crossing over the Florida crustal arch
Withlacoochee watershed			triple point: Suwannee/Withlacoochee River (Florida) (west) & St. Johns River (east)
Miami watershed			triple point: Withlacoochee (west) & St. Johns River/Miami River (east)
Kissimmee/Okeechobee watershed			south point of ECD @ Withlacoochee & Miami/Kissimmee triple point