# Lock 21: Swains Lock

Historic site in Potomac, MD. Adrenaline 1/5 (Chill: Sit back, stroll, take it in.) All ages. Outdoor.

- Address: Potomac, MD
- Coordinates: 39.031216, -77.243474

## Nearby
Adrenaline scale: 1 Chill, 2 Easy, 3 Active, 4 Thrill, 5 Extreme.
1. Lock 21 “Swains” Campground | Camping | Easy 2/5 | All ages | Outdoor | Potomac, MD | under 0.1 mi | https://www.activityplaces.com/place/lock-21-swains-campground-potomac-md
2. Riverbend Park Nature Center | Attraction | Chill 1/5 | All ages | Indoor & outdoor | Great Falls, VA | 0.7 mi | https://www.activityplaces.com/place/riverbend-park-nature-center-great-falls-va
3. Riverbend Park | Nature area | Easy 2/5 | All ages | Outdoor | Great Falls, VA | 1.0 mi | https://www.activityplaces.com/place/riverbend-park-great-falls-va
4. Saints Peter and Paul Antiochian Orthodox Christian Church playground | Park | Chill 1/5 | All ages | Outdoor | Potomac, MD | 1.4 mi | https://www.activityplaces.com/place/saints-peter-and-paul-antiochian-orthodox-christian-church-playground-potomac-md
5. Adventure Conservation Park | Nature area | Easy 2/5 | All ages | Outdoor | Potomac, MD | 1.6 mi | https://www.activityplaces.com/place/adventure-conservation-park-potomac-md
6. Kilgour Branch Stream Valley Park | Nature area | Easy 2/5 | All ages | Outdoor | Potomac, MD | 1.9 mi | https://www.activityplaces.com/place/kilgour-branch-stream-valley-park-potomac-md

## Source
- Page: https://www.activityplaces.com/place/lock-21-swains-lock-potomac-md
- Place data: © OpenStreetMap contributors (Open Database License (ODbL) 1.0), https://www.openstreetmap.org/way/137400975, last checked 2026-11-13
- Adrenaline level and audience are ActivityPlaces editorial ratings by activity type, not measurements. Confirm hours and prices with the venue.