Ellenborough Falls are situated on the Ellenborough River and are the longest single drop falls in the Southern Hemisphere.
Various figures are given ranging from 200 metres on the Greater Taree City Council website to 130 metres on another. The reality is probably somewhere in between with one figure quoted as - single drop 160 metres - full height 200 metres.
I would be interested to know if anyone can provide more precise information.

Ellenborough Falls are situated at 390 metres above sea level on the edge of the Bulga Plateau not far from the rural village of Elands. A drive of some 29 km west of Wingham on the NSW Mid North Coast will get you there but the last 17 km is gravel road and is sometimes treacherous in wet conditions.
A kiosk operates at the top, with viewing platforms at the point the falls crash over the escarpment, as well as at the Knoll, a point from which views back across the gorge can be had. After the strenuous 641 step walk down the timber boardwalk to the bottom a comfortable seat awaits from where one can take in the full majesty of these 200 metre high falls. Unfortunately there is no escalator to return you to the top.
The walk to the bottom passes through sub tropical rainforest with some large red cedars and birds nest ferns to be seen along the way. While the walk down, and the breathlessness of the return journey are obvious disincentives the effort is well worth it.
Australia's tallest waterfalls are the Wallaman Falls west of Ingham in North Queensland at 305 metres but it has numerous ledges.
The Wollombi Falls, east of Armidale are the second highest and are reportedly 220 metres high with a single drop of 100 metres.