| Boundary Stream Mainland Island | |
| Coordinates: | -39.1044°N 176.8039°W |
| Opened: | 2017 |
| Location: | Hawke's Bay Region, New Zealand |
Boundary Stream Mainland Island is a mainland island in the Hawke's Bay Region of New Zealand.[1]
It is managed by the Department of Conservation.
The park includes the Hawke's Bay Region's highest waterfall and several walks, including walks suitable for children.[2]