A winding blackwater river that draws the line between two states. The St. Marys carries tannin-dark water past bright sandbars from the edge of the Okefenokee to the Atlantic.
The St. Marys is a blackwater river that forms much of the Georgia-Florida line. It rises near the Okefenokee Swamp and winds east to the Atlantic near the town of St. Marys. Expect white sandbars for camping, tannin-stained water, redbreast and catfish fishing, and tidal lower reaches near the coast. Public access comes from landings such as Trader's Hill and various bridges. Spring and fall bring the best conditions; always check water levels and confirm access before you go.
The St. Marys River rises near the Okefenokee Swamp and traces much of the border between Georgia and Florida on its way to the Atlantic. It ends near the town of St. Marys, Georgia, across from Florida and close to the coast. For most of its length it is a classic lowland blackwater river: slow gradient, sandy bottom, tannin-dark water, and banks lined with cypress, live oak, and gum.
Like other rivers in this region, the St. Marys winds constantly, so straight-line map distance and actual paddling distance differ significantly. As the river nears the coast it becomes tidal, which changes how the water moves. Plan by river miles and time on the water, and account for the tide on the lower reaches rather than assuming a steady downstream push the whole way.
Public access to the St. Marys comes mainly from established landings and bridge crossings along its length. Trader's Hill is one well-known access area, and various bridges provide additional launch and take-out points. Many trips are run as point-to-point paddles between two landings, which means arranging a vehicle shuttle.
Because much of the land bordering the river is private, treat put-ins and take-outs as the places to get on and off, and be mindful of property lines in between. Ramp names, conditions, and parking change over time. Confirm the specific landings you plan to use, their current condition, and shuttle logistics before your trip. Local outfitters and county recreation departments on both the Georgia and Florida sides are good sources for up-to-date access information.
Spring and fall are the sweet spots on the St. Marys. Temperatures are mild, the bugs are lighter than in midsummer, and moderate flows keep the white sandbars exposed for camping while still giving you enough water to move comfortably.
Water level drives everything on the upper and middle river. In low water, more sandy shoals and deadfall are exposed, which means more dragging and occasional portages. After heavy rain the river comes up fast, moves quicker, and can submerge the sandbars you were counting on for camp while pushing debris into strainers. On the tidal lower reaches, the tide adds another variable on top of river flow. Check the nearest USGS or state river gauge, and the tide tables for the lower sections, before you launch, and match your plan to what the water is actually doing that week.
The St. Marys runs through classic Georgia and Florida gator country, and alligators are a normal part of the ecosystem here. Most encounters are undramatic: a gator sliding off a warm bank into the water as you round a bend. Give them room, never feed or approach them, and keep pets and food secured in camp. Avoid swimming at dawn, dusk, and after dark, when alligators are most active.
The bigger day-to-day hazards are usually strainers, deadfall, and, on the lower river, tides and wind. Downed trees can span the channel on tight bends, and the current can push a boat into them, so scout blind corners and be ready to portage. On the tidal reaches, a turning tide can work against you, so time your paddling with it. Keep a knife accessible, wear your PFD, and never pin yourself against a strainer. Carry more water than you think you need, tell someone your route and timeline, and plan for limited cell service.
Rules on the St. Marys depend on who owns and manages the land at any given spot, and the river straddles two states, so regulations can differ from one bank to the other. Paddling the river itself is generally open, but camping is a different matter: many inviting sandbars sit directly against private property, and what is legal to camp on varies from tract to tract.
Before you commit to a camp, confirm current regulations with the managing agency or landowner, respect posted signs, and never assume a sandbar is open just because it looks empty. A fishing license is required for anglers, and because the river borders Georgia and Florida, check which state's rules apply where you are fishing. Above all, practice Leave No Trace: pack out everything, use existing sites, and leave the sandbars cleaner than you found them so access stays open for the next paddler.
We have documented our own runs on the St. Marys. Watch the expeditions to see the real conditions: the bends, the deadfall, the white sandbar camps, and the water as it actually is.
Our step-by-step course on planning, packing, and running multi-day blackwater canoe trips. Everything behind an expedition like the St. Marys.
The community, courses, and app behind every trip we run. Trade notes with other paddlers who run these rivers.
The St. Marys is a blackwater river that forms much of the Georgia-Florida state line. It rises near the Okefenokee Swamp and winds east to the Atlantic near the town of St. Marys, Georgia. The lower reaches are tidal as the river nears the coast.
Spring and fall are the most comfortable, with milder temperatures and fewer biting insects. Moderate water gives the best white sandbar camping. Low water exposes more shoals and deadfall, and high water after heavy rain moves fast and can bury the sandbars. Check the current gauge readings before you launch.
Yes. Alligators live throughout the St. Marys and the surrounding coastal plain of Georgia and Florida. Encounters are usually a gator sliding off a bank. Keep your distance, never feed them, keep pets and food secured in camp, and avoid swimming at dawn, dusk, and after dark.
The lower reaches are tidal as the river approaches the Atlantic near the town of St. Marys. On the tidal sections, current and water level change with the tide, so time your paddling and plan camps and take-outs around the tide rather than assuming a steady downstream flow.
Public access comes from landings such as Trader's Hill and various bridge crossings along the river. Many trips run point-to-point between two landings, which means arranging a vehicle shuttle. Confirm current ramp conditions, parking, and access before your trip, since these change over time.