A coroner has found that the drowning of an Australian tennis coach in the Waikato River last year was a ''tragic accident''.

Paul Harlan Arber was in Hamilton, New Zealand, with students he was coaching for a junior tournament when he disappeared on December 7, 2013. He was part of a group of about 50 Australian coaches and players when he disappeared.

Five days later he was found dead in the Waikato River by teenage rowers.

Rotorua coroner Wallace Bain found Mr Arber's death was caused by drowning and there was no indication he had taken his life. ''There is nothing at all to suggest that this is anything but a tragic accidental death.''