Greater Western Sydney
Encompassing significant areas of national parks , waterways and parklands , agricultural lands , natural bushland and a range of recreational and sporting facilities , the region also largely contains remnants of critically endangered native Cumberland Plain Bushland and World Heritage-listed areas of the Blue Mountains . The Hawkesbury and Nepean River system is Sydney's firsthand water source and the mainstay of the region's agricultural and fishing industries , and is also major recreational area for the inhabitants of GWS . 
<triplet> Hawkesbury <subj> Nepean River <obj> tributary <triplet> Nepean River <subj> Hawkesbury <obj> mouth of the watercourse