  Haystack | |
| Geography | |
|---|---|
| Location | Investigator Strait |
| Coordinates | 35°19′19″S 136°54′26″E / 35.32191°S 136.9071°E |
| Length | 500 m (1600 ft) |
| Width | 120 m (390 ft) |
| Highest elevation | 43 m (141 ft) |
| Administration | |
Australia | |
Haystack Island is an island located in Investigator Strait off the south coast of Yorke Peninsula in the Australian state of South Australia about 6 kilometres (3.7 miles) south-west of Stenhouse Bay. Since 1972, it has been part of the Althorpe Islands Conservation Park.