Lakes / Maine / South Twin Lake
South Twin Lake, Maine
18,652 acres
Surface Area
101 ft
Max Depth
28 ft
Average Depth
17.4 mi
Shoreline
489 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Maine
45.62 degrees N, 68.87 degrees W - spans Penobscot, Piscataquis Counties. State and county outlines drawn from Census boundary data; the lake marker is placed by its Maine DEP coordinates, not by eye. Schematic - not a survey map.
Depth Profile - South Twin Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.
How South Twin Lake Stacks Up
- Ranks #5 for surface area among the Maine lakes counted so far - 18,652 acres.
- The largest lake in Penobscot County among those counted.
- Its average depth of 28 ft is more than 2 times a typical shallow Maine lake, which averages under 10 ft.
- About 57 miles from Bangor, as the crow flies.
Facts and Figures
Lake ID (MIDAS)982
CountyPenobscot, Piscataquis
TownsT3 Indian Purchase Twp, T4 Indian Purchase Twp, T4
Lake TypeColdwater + Warmwater
Coordinates45.6238, -68.8723
Deepest Natural Lakes in Maine
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Sebago Lake | Cumberland | 30,536 acres | 316 ft |
| 2 | Moosehead Lake | Piscataquis | 75,473 acres | 246 ft |
| 3 | Tunk Lake | Hancock | 2,071 acres | 222 ft |
| 4 | Pleasant Pond | Somerset | 1,037 acres | 198 ft |
| 5 | Schoodic Lake | Piscataquis | 7,021 acres | 188 ft |
Largest Lakes in Maine
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Moosehead Lake | Piscataquis | 75,473 acres | 246 ft |
| 2 | Sebago Lake | Cumberland | 30,536 acres | 316 ft |
| 3 | Chesuncook Lake | Piscataquis | 28,250 acres | 150 ft |
| 4 | Spednic Lake | Washington | 19,618 acres | 54 ft |
| 5 | South Twin Lake | Penobscot, Piscataquis | 18,652 acres | 101 ft |
Sources: Maine DEP / Lakes of Maine lake data (ID 982); USGS. Verified October 30, 2026.