| Harkness Memorial State Park | |
|---|---|
 The mansion and gardens from above | |
  Harkness Memorial State Park Location in Connecticut  Harkness Memorial State Park Harkness Memorial State Park (the United States) | |
| Location | Waterford, Connecticut, United States |
| Coordinates | 41°18′18″N 72°06′48″W / 41.30500°N 72.11333°W |
| Area | 304 acres (123 ha)[1] |
| Elevation | 30 ft (9.1 m) |
| Established | 1950 |
| Administered by | Connecticut Department of Energy and Environmental Protection |
| Designation | Connecticut state park |
| Website | Official website  |
Eolia—The Harkness Estate | |
| Location | Great Neck Road, Waterford, Connecticut |
| Area | 220 acres (89 ha) |
| Built | 1906-1907 |
| Architect | Lord & Hewlett; et al. |
| Architectural style | Late 19th and 20th Century Revivals, Second Renaissance Revival |
| NRHP reference No. | 86003331 |
| Added to NRHP | November 20, 1986 |
Harkness Memorial State Park is a historic preservation area with botanical garden and recreational features located on Long Island Sound in the town of Waterford, Connecticut. The state park's 304 acres (123 ha) center around Eolia, a 42-room Renaissance Revival mansion with formal gardens and greenhouses. The park is managed by the Connecticut Department of Energy and Environmental Protection.[2]