|Address:||Yanchep Caves, Yanchep National Park, Yanchep. W.A. 6035. Tel: +61-9-561-1004. Jim Smith, Ranger-in-Charge.|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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The Yanchep National Park is one of Perth's most popular recreation areas and tourist destinations. 2842ha of bushland, wetlands, woodlands and caves. The Name Yanchep was derived from the Aboriginal word Yanget which means Bulrush named after the bulrushes which fringe the lakes.
Yanchep is located at the end of a chain of lakes situated on the Swan Coastal Plain. These lakes are windows to a huge underground cave system.
The Yanchep cave area is contained mainly within the Yanchep National Park but extends south to the semi-residential Wanneroo area. Currently there is one tourist cave in the National Park called Crystal Cave. But there is talk of reinstating Yonderup Cave as a tourist cave in the redevelopment plan for the area. The area has possibly over 1000 caves and karst features. The limestone here is only 10 m above the water table resulting in frequent collapses.
The Yanchep caves are of the small, crawly inclined fissure type.
East of Yanchep area is a vast area of sandplain at the base of the Darling Fault Scarp. This area serves as a catchment for the Gnangara water mound, a feature of great importance in the future of Perth's water supply. The slope of this mound increases in the area of the Yanchep caves and the water moves mainly as streams down this gradient. The numerous enclosed water-logged depressions and lakes within the karst no doubt play a role in recharging karst water and may themselves be the result of a series of cavern collapses and stream diversions. Springs have been seen in the sea west of Yanchep.