At Careel Bay is the most significant area of estuarine wetlands in the Northern Beaches. It contains a combination of natural features, rare in the Sydney region, that provide habitat for a variety of marine life and bird species.

Birdwatchers will love the walking track and boardwalk that provide easy access for visitors. A total of 116 bird species have been recorded at Careel Bay including the endangered Bush Stone-Curlew along with the Mangrove Gerygone and international migratory species such as the Eastern Curlew, Whimbrel and Bar-tailed Godwit.