A diverse fauna is also found in this relatively high rainfall
region. However, the region around Perth is heavily developed
and much of this region has already been cleared. While there
are several large protected areas in the region, continued
development, habitat fragmentation, dieback disease, and
inappropriate fire regimes are serious threats. Location and
General Description South of Perth down to Cape Naturaliste, the
Swan Coastal Plain forms a low-lying belt 25 kilometers (km) to
30 km wide, bordered to the east by the Darling Scarp and the
Precambrian Yilgarn Block. The Swan Coastal Plain is covered by
shoreline and associated dune deposits from the Pleistocene and
Holocene that overlie Paleozoic and Neogene deposits of the
Perth Basin. The Plain also includes large microtidal estuarine
systems, such as the Swan-Canning Estuary and a number of lakes
cut off from the sea by barrier dunes. The Swan Coastal Plain is
transected by rivers flowing west from the Darling Plateau, and
interspersed by wetlands