Lakes / Georgia / Forsyth County / Lake Sidney Lanier
Lake Sidney Lanier, Georgia
38,293 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Georgia
34.26 degrees N, 83.96 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 Lake Sidney Lanier Stacks Up
- Ranks #2 for surface area among the Georgia lakes counted so far - 38,293 acres.
- The largest lake in Forsyth County among those counted.
- About 41 miles from Athens, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Looper Lake | Hall | 8.8 mi | 44 acres |
| Twin Lakes | Forsyth | 10 mi | 37 acres |
| Reservoir 21 | Forsyth | 10 mi | 32 acres |
| Reservoir Number One | Forsyth | 14 mi | 30 acres |
| Lake Upper Mulberry River Eleven | Gwinnett | 15 mi | 46 acres |
| Watershed Y17 Lake | Gwinnett | 17 mi | 31 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Sidney Lanier
How Big Is Lake Sidney Lanier?
Lake Sidney Lanier covers 38,293 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 34974901). Verified October 30, 2026.