Lake Delano is a reservoir within the F. D. Roosevelt State Park, in Harris County, Georgia.
There are a number of conflicting information, but the lake is officially Lake Delano. Per official Georgia State Park website:
"2 Lakes (15-acre Lake Delano and 25-acre Lake Franklin)"[3]
Lake Delano was named after Sara Roosevelt, the presidential mother. A variant name is "Delano Lake".