| Site of Special Scientific Interest | |
 Cliffs at Yeol Mouth, to the north of the site | |
  Location within Cornwall  Steeple Point to Marsland Mouth (England) | |
| Location | Cornwall |
|---|---|
| Grid reference | SS212174 |
| Coordinates | 50°54′54″N 4°33′36″W / 50.9149°N 4.5599°W |
| Interest | Biological |
| Area | 342.8 hectares (3.43 km2; 1.32 sq mi) |
| Notification | 1973 |
| Natural England website | |
Steeple Point to Marsland Mouth is a coastal Site of Special Scientific Interest (SSSI) in Cornwall, England, UK, noted for its biological characteristics.