The Great North Walk 100s (GNW100s) are two simultaneous trail races, a 100 Mile and a 100 Kilometre, along The Great North Walk south from Teralba on Lake Macquarie. The 100 Kilometre race will finish at Yarramalong in the scenic Yarramalong Valley and the 100 Mile at Patonga on spectacular Broken Bay. Although the route is primarily on foot tracks and fire-trails, it does include some minor back roads. There is more than 6,200 metres (20,000ft) of ascent (and descent) in the 100 Mile and 3,800 metres (12,500ft) of ascent in the 100 Kilometre.
Both races will start at 6:00am on Saturday, 10 November 2012. There will be cut-off times at Checkpoints en route and the overall time limits will be 22 hours for the 100 Kilometre and 36 hours for the 100 Mile.
