Lakes / Louisiana / Tensas County / Lake Formosa
Lake Formosa, Louisiana
68.88 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Louisiana
31.99 degrees N, 91.46 degrees W - Tensas County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Louisiana Department of Wildlife and Fisheries coordinates, not by eye. Schematic - not a survey map.
How Lake Formosa Stacks Up
- Larger than 27% of the 664 lakes counted in Louisiana.
- About 108 miles from Baton Rouge, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Green Lake | Tensas | 4.4 mi | 40.34 acres |
| Board Tree Lake | Franklin | 5.4 mi | 118 acres |
| Lake Dean | Franklin | 6.6 mi | 65.61 acres |
| Brushy Lake | Tensas | 7.8 mi | 28.37 acres |
| Big Lake | Tensas | 12 mi | 140.68 acres |
| Brushy Lake | Tensas | 14 mi | 2,991.51 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Formosa
How Big Is Lake Formosa?
Lake Formosa covers 68.88 acres in Tensas County, Louisiana.
What Is the Largest Lake in Tensas County?
Brushy Lake is the largest lake in Tensas County, at 2,991.51 acres.
Deepest Natural Lakes in Louisiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | False River | Pointe Coupee | 3,212 acres | 65 ft |
| 2 | Vernon Lake | Vernon | 6 acres | 53 ft |
| 3 | Lake Concordia | Concordia | 1,026 acres | 50 ft |
| 4 | Caney Creek Reservoir | Jackson | 4,738 acres | 43 ft |
| 5 | Lake Providence | East Carroll | 1,380 acres | 37 ft |
All 27 Louisiana lakes ranked by depth
Largest Lakes in Louisiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Pontchartrain | Jefferson | 407,803.25 acres | - |
| 2 | Toledo Bend Reservoir | Sabine | 181,600 acres | 110 ft |
| 3 | Lake Maurepas | Livingston | 58,308.4 acres | - |
| 4 | Sabine Lake | Cameron | 56,867.74 acres | - |
| 5 | White Lake | Vermilion | 55,913.91 acres | - |
All 664 Louisiana lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID {58bf3043-2268-4821-bb9b-d04a3784530a}). Verified October 30, 2026.