TE PEWHAIRANGI (BAY OF ISLANDS) MARINE MAMMAL SANCTUARY. All persons and vessels must keep 300 metres clear of all marine mammals within the sanctuary. 5 knot speed restrictions exist in safe zones between Motuarohia Island (Roberton Island) and Moturua Island, and within the bay enclosed by a line between Tapeka Point and Whangaiwahine Point. Contact Department of Conservation for full details.