Te Houtaewa Challenge is said to be the world's only ultra-marathon run entirely on sand. It is based on the legend of Te Houtaewa, who evaded capture after stealing two baskets of kumara by running the length of Ninety Mile Beach, also known as Te Oneroa a Tohe.
Some of tomorrow's runners are likely to carry kumara as a tribute to the great athlete.
A living legend who won't be taking part, however, is Awanui farmer Lilac Flay.
Flay has competed in, and won, all but a few of the 20 ultra-marathons to date.
The 56-year-old is unable to run this year because of a back injury and she missed out last year due to an infection. Instead Flay will take part in the 6km Project Promise fundraiser. "If I can't run I might as well walk," she said.
Conditions look promising with cloudy periods and a northeasterly tailwind forecast for tomorrow.
The event is organised by Te Houtaewa Maori Charitable Trust.