Dee Why Lagoon

Dee Why Lagoon is a coastal intermittently closed lagoon and declared Wildlife Refuge in Dee Why on Sydney's Northern Beaches, New South Wales. Separated from the Tasman Sea by a sand barrier and Dee Why Beach, it covers about 77 hectares including surrounding parkland. Notable for its wetland ecosystem, birdlife and scenic walking trail, it is one of the Northern Beaches' most significant natural reserves and a protected habitat for native flora and fauna.

Visitors can expect a tranquil coastal lagoon surrounded by reeds, paperbarks and open parkland with a flat circuit walking track around its perimeter. The lagoon is separated from the ocean by dunes and Dee Why Beach, with views to Long Reef Headland. There are bird hides and viewing platforms for observing waterbirds, picnic areas at James Meehan Reserve and The Strand, and interpretive signage about ecology and Aboriginal heritage. The area is natural and undeveloped, focused on nature appreciation rather than built attractions.