Alert Stack
| Geography | |
|---|---|
| Location | Snares Islands |
| Coordinates | 48°02′15″S 166°34′30″E / 48.03750°S 166.57500°E |
| Area | 14 ha (35 acres) |
| Length | 400 m (1300 ft) |
| Width | 400 m (1300 ft) |
| Administration | |
New Zealand | |
| Region | New Zealand outlying islands |
| Demographics | |
| Population | uninhabited |
Alert Stack is an outlying island of New Zealand. It is a part of the Snares Islands, lying southwest of North East Island. There is an estimated five pairs of nesting Antarctic tern as of 2018.