Belfast Reserve is listed as a nature reserve at 52A Goodall Street in Hillsborough, Auckland. It has a 4.4 rating on Google, and its listing links to an Auckland Council park detail page.
A good nature reserve protects habitat for plants and wildlife while letting people walk through it quietly. A suburban reserve is often a pocket of bush, grass or a stream corridor, so it suits a short walk, birdwatching or a breath of green space close to home. Hillsborough sits on the Manukau Harbour side of Auckland, near Hillsborough's coastal reserves and walkways, so a small reserve here may connect to paths and views of the harbour. Regulars know that early mornings are best for birdsong, that paths can be muddy after rain, that tracks may be narrow or steep and that the council's park page lists facilities and any closures. Stay on the paths, keep dogs out if signs say so, never disturb nesting birds and take your rubbish home. Wear sturdy shoes and check where to park.
For anyone in Hillsborough and southern Auckland, Belfast Reserve on Goodall Street is a quiet local green space to explore.