Lakes / Georgia / Forsyth County / Reservoir 21
Reservoir 21, Georgia
32 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Georgia
34.31 degrees N, 84.13 degrees W - Forsyth County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Reservoir 21 Stacks Up
- Larger than 27% of the 728 lakes counted in Georgia.
- About 41 miles from Atlanta, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Twin Lakes | Forsyth | 2.8 mi | 37 acres |
| Reservoir Number One | Forsyth | 3.5 mi | 30 acres |
| Lake Sidney Lanier | Forsyth | 10 mi | 38,293 acres |
| Almond Lake | Cherokee | 13 mi | 27 acres |
| Sconti Lake | Pickens | 14 mi | 30 acres |
| Lake Petit | Pickens | 14 mi | 107 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Reservoir 21
How Big Is Reservoir 21?
Reservoir 21 covers 32 acres in Forsyth County, Georgia.
What Is the Largest Lake in Forsyth County?
Lake Sidney Lanier is the largest lake in Forsyth County, at 38,293 acres.
Largest Lakes in Georgia
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | J. Strom Thurmond Reservoir | Lincoln | 40,816 acres | - |
| 2 | Lake Sidney Lanier | Forsyth | 38,293 acres | - |
| 3 | Walter F George Reservoir | Quitman | 34,919 acres | - |
| 4 | J. Strom Thurmond Reservoir | Columbia | 25,660 acres | - |
| 5 | West Point Lake | Troup | 22,313 acres | - |
All 728 Georgia lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 41276155). Verified October 30, 2026.