Browse Map

Explore away

Explore Map Collection

Check out our basemaps

Print a Map Plus

Generate a high-quality PDF

Field Guide

Discover local flora, fauna, geology, and more

Local Flora & Fauna

Learn the ecology of your area

Local Geology

Learn the geologic formation at your feet

Get Started or Sign In

Welcome

Continue with Apple

Already have an account? Sign In

MAP

Topo

Measure

Topo

Ecoregions

Public Lands

...

BASEMAPS

Default Weather

Temperature

Smoke

...

WEATHER

Saint Marys River

River in Atlantic Coastal Plain in St. Marys in GA, FL

Georgia Fishing Regulations

Florida Freshwater Fishing Regulations

Florida Saltwater Fishing Regulations

Print Map

Generate High-Quality PDF

Length

125mi

On the Web

On Wikipedia

The St. Marys River (named Saint Marys River by the USGS, and sometimes misspelled as St. Mary's River) is a 126-mile-long (203 km) river in the southeastern United States. From near its source in the Okefenokee Swamp, to its mouth at the Atlantic Ocean, it forms a portion of the border between the U.S. states of Georgia and Florida. The river also serves as the southernmost point in the state of Georgia. The St. Marys River rises as a tiny stream, River Styx, flowing from the western edge of Trail Ridge, the geological relic of a barrier island/dune system, and into the southeastern Okefenokee Swamp. Arching to the northwest, it loses its channel within the swamp, then turns back to the southwest and reforms a stream, at which point it becomes the St. Marys River. Joined by another…

Classified As

River