The Barron River has a catchment area of about 1980 square kilometres above Kamerunga at the mouth of the delta and has its headwaters in the area immediately east of Atherton on the elevated ...

The Sydney region is physically defined by the boundaries of the following catchment areas, from north to south as shown in Figure R2. Hawkesbury–Nepean River catchment: Catchment area is 22,000 km².