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Christchurch is not often considered the site of one of the nation’s geological wonders. It lies on a flat river delta, on plains that sprawl west and south and a vast coastline that arches north.
But turn south-east and you will see the Port Hills rising steeply above the city, the grand remnants of the Lyttelton volcano crater, eroded and battered for the past eight million years.
Lyttelton Harbour is the home to Christchurch’s port, the area’s highest peak plus a number of hiking landmarks positioned around the crater rim.
Every winter a group of enthusiasts run a 53km ultra race around the rim of Lyttelton Harbour, starting at Diamond Harbour and finishing at Hansen Park in Christchurch. Christchurch Tramping Club tackles a similar route in an annual walking marathon.
A technical challenge the crater rim is not, but the task of walking or running 40–50km of trail in a day is substantial, even if you’re a hardcore tramper.
Having recently moved back to Christchurch, I decided to make the crater rim my primary tramping challenge. I would start in Diamond Harbour and work my way around to Lyttelton. I had done most of this route in sections and knew much of it was exposed tussock and farmland, which meant the weather was an important factor.
On the crater rim route, if the wind gets up, rain comes in and the temperature drops, it’s easy to throw on another layer. But with next to no shade along the way, the sun can also make this route pretty uncomfortable.
From the starting line on the rocky beach at Diamond Harbour I could see the finish line at Lyttelton a mere 3km away, directly across the water. It would be over eight hours before I was that close again.

