| Alton Water | |
|---|---|
 The reservoir is used for a variety of water sports. | |
  Alton Water | |
| Location | Suffolk |
| Coordinates | 51°58′50″N 1°8′0″E / 51.98056°N 1.13333°E |
| Type | reservoir |
| Basin countries | United Kingdom |
| Surface area | 400 acres (160 ha) |
| Max. depth | 20 m (66 ft) |
Alton Water (or Alton Reservoir) is a manmade reservoir located on the Shotley peninsula. It is the largest in Suffolk, with a perimeter of over 8 miles (13 km).