Lakes / Maryland / St. Mary's County
Lakes in St. Mary's County, Maryland
3 lakes counted in St. Mary's County - the largest is Saint Marys Lake at 226 acres.
3
Lakes Counted
226 acres
Largest - Saint Marys Lake
St. Mary's County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Saint Marys Lake | St. Mary's | 226 acres | - |
| 2 | Green Holly Pond | St. Mary's | 31 acres | - |
| 3 | Pond Number Three | St. Mary's | 27 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.