| Site of Special Scientific Interest | |
 | |
  Location within Devon | |
| Location | Devon Cornwall |
|---|---|
| Coordinates | 50°20′46″N 4°07′19″W / 50.3461°N 4.12208°W |
| Interest | Geological |
| Area | 44.3 hectares (0.443 km2; 0.171 sq mi) |
| Notification | 1997 |
| Natural England website | |
Plymouth Sound, Shores and Cliffs is a Site of Special Scientific Interest (SSSI) around the Plymouth Sound, a large area of water where the River Plym and Tamar meet. It stretches across the two ceremonial counties of Devon and Cornwall and the unitary authority area of Plymouth. It contains fossils of plants and sea creatures and its cliffs show a timeline of the Middle to Early Devonian period hundreds of millions of years ago