Shot of Maryland State Route 4, heading southbound in St. Mary's County in Southern Maryland. This is just before the intersection with MD 235 (Three Notch Rd).
Shot of Maryland State Route 4, heading southbound in St. Mary's County in Southern Maryland. This is just before the intersection with MD 235 (Three Notch Rd). Joshua Kinard · CC BY-SA 3.0

St. Mary's River State Park

State Park · Maryland · Maryland Park Service

Plan your visit

Know before you go

Official site
dnr.maryland.gov
Managed by
Maryland Park Service

Getting there

Directions on Google Maps →

Things to do

Activities & features: Boating

Nearby parks

Parks of Maryland

Elk Neck State ParkPiscataway ParkAntietam National BattlefieldClara Barton National Historic SiteOxon Cove Park & Oxon Hill FarmTuckahoe State ParkPoint Lookout State ParkGreenbrier State ParkHarriet Tubman Underground Railroad National Historical ParkBaltimore-Washington ParkwayFort Washington ParkGunpowder Falls State ParkHampton National Historic SiteStar-Spangled Banner National Historic TrailNew Germany State ParkNorth Point State ParkSusquehanna State ParkFort Foote ParkMonocacy National BattlefieldSandy Point State ParkMartinak State ParkPatapsco Valley State ParkGreenbelt ParkFranklin Point State ParkCunningham Falls State ParkAssateague Island National SeashoreJanes Island State ParkSeneca Creek State ParkCatoctin Mountain ParkRocks State ParkGlen Echo ParkNewtowne Neck State ParkFort Frederick State ParkThomas Stone National Historic SiteRocky Gap State ParkHerrington Manor State ParkHarmony HallFort McHenry National Monument and Historic ShrinePocomoke River State Park

40 parks mapped in Maryland

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Guides for the trip

All guides →

Sources: Wikimedia Commons / editorial, State agency · updated 2026-09-12