Yellagonga

Yellagonga Regional Park is a 1,550-hectare urban wetland and bushland reserve in the northern suburbs of Perth, stretching along the spine of the Gnangara Mound from Lake Joondalup to the south. The park protects the internationally significant Lake Joondalup (Beenyup in Whadjuk Noongar language), Lake Goollelal, and adjacent banksia woodland. The park is named after Yellagonga, a Whadjuk Noongar leader of the early contact period. It is jointly managed by DBCA, the City of Wanneroo, and the City of Joondalup.

Yellagonga is a critically important habitat for Carnaby's black-cockatoo, with the park providing one of the best remaining nesting and foraging habitats in the northern Perth metropolitan area. Lake Joondalup supports the largest overwintering colony of black swans (Cygnus atratus) in the Perth metropolitan region, with thousands of swans present May–October. Pelicans, herons, royal spoonbills, cormorants, and numerous duck species are resident. Osprey nests have been recorded. Quendas, brush wallabies, and western grey kangaroos inhabit the banksia woodland. Freshwater turtles and water rats occur in the lake.

Banksia woodland (Banksia attenuata, B. menziesii) on Bassendean sands borders the lakes and is the primary foraging and nesting habitat for Carnaby's black-cockatoos. Melaleuca preissiana paperbarks fringe the lake edges. The lake supports aquatic vegetation including stoneworts (charophytes), milfoil, and water ribbons. Several Declared Rare Flora species occur in the park, including the swamp sheoak (Allocasuarina paludosa).

Yellagonga sits on the Gnangara Mound — a dome-shaped body of fresh groundwater floating above saline groundwater beneath the northern Swan Coastal Plain. Lake Joondalup is a groundwater-dependent lake: its water level reflects the Gnangara Mound water table. The lake occupies a deflation basin in Bassendean aeolian sands. Tamala Limestone underlies the sands in the deeper parts of the mound.

Mediterranean climate. Annual rainfall 700–750 mm. The Gnangara Mound recharges from winter rainfall over the northern coastal plain. Declining winter rainfall from climate change is reducing mound levels and lake water depths, threatening the ecological values of the park.

Lake Joondalup (Beenyup) is a Whadjuk Noongar sacred site of exceptional significance. The lake and surrounding wetlands were central to Whadjuk Noongar law, ceremony, and food procurement. The park is named after Yellagonga, a senior Whadjuk leader who maintained relationships with the early European settlers before their 1833 conflict with his son Midgegooroo and grandson Yagan. The park naming honours the Whadjuk Noongar people's enduring connection to this country.

Yellagonga Regional Park was developed progressively through collaboration between the State Government and local governments to protect the last significant natural areas in the rapidly urbanising northern suburbs of Perth. The dual management arrangement between DBCA and local governments reflects the park's urban nature-based recreation role as well as its conservation values.

Walking and cycling trails totalling approximately 24 km around Lake Joondalup and Lake Goollelal. Black swan and waterbird viewing, particularly at Lake Joondalup during winter roosting season. Banksia woodland wildflower walks (August–October). Birdwatching for Carnaby's black-cockatoos. Multiple picnic areas and lake viewpoints.

Multiple entry points throughout the Cities of Wanneroo and Joondalup, north of Perth. Car parks, picnic areas, toilets, and cycling/walking trail networks. Free entry. Accessible by public transport from Joondalup train station.

Gnangara Mound groundwater decline is the most critical long-term threat — Lake Joondalup water levels have dropped 1.5 metres since the 1970s due to reduced rainfall recharge. Phytophthora cinnamomi dieback threatens banksia woodland and proteaceous understorey. Urban edge effects including weed introduction (arum lily, cape tulip, kikuyu) and illegal vegetation clearing require active management. Carnaby's black-cockatoo requires hollow-bearing banksia trees — the urban landscape limits hollow availability. Fox and cat predation affects ground-nesting birds and small mammals.