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Dunedin runner Jake Jackson-Grammar won the inaugural Orokonui Challenge race on Sunday.
Run in chilly and damp conditions, the 18.5km race traversed varied terrain in the ecosanctuary.
Jackson-Grammar recorded a time of 1hr 19min 35sec and was nearly 10 minutes ahead of veteran Michael Walkin, with Nathan Shanks in third.
The first female home was Dani Nicolson, who recorded a time of 1hr 37min 52sec, which was good enough for sixth overall.
Masters runner Bridget Thompson was the second woman home, just over six minutes behind Nicolson, while Wendy MacKinnon was third.
A capacity field of 100 entered the event, which was held to raise funds for the ecosanctuary.
A walking event took place at the sanctuary on April 22.