sentences:  The southern part is known as the South West Yarragadee Aquifer.The aquifer is quite deep, situated hundreds of metres below ground level and with a thickness ranging up to about two kilometres.In the Perth area, the Yarragadee Aquifer is located beneath the Leederville Aquifer, which itself is located beneath two superficial aquifers known as the Gnangara Mound and Jandakot Mound.