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The nine-day ride will be undertaken with 20 other sponsored NZ riders raising money for a World Vision project to install a clean drinking water system in a village in the Koh Andaet district.
The rural areas in Cambodia lack clean drinking water and health services are limited.
About $60,000 will be raised from the NZ riders' sponsorship and other fundraising towards the cost of the drinking water project, Ms Sivertsen said To help raise sponsorship money the couple are running a second-hand book sale in the Karitane Bowling Club's rooms at Stornoway St, Karitane, on the Saturday of Labour weekend from 10am to 2pm.
This is their last fundraiser.
The couple have raised $8,500 through donations, an Easter garage sale, the collection and sale of obsolete NZ coins and corporate sponsorship.
Ms Sivertsen and Mr Shaw are cycling up to 100km a week in the Karitane area and between Karitane and Dunedin to get in practice for the Cambodian ride.
It will be a lot hotter in Cambodia, with temperatures likely to average about 30degC when the nine-day ride starts in mid November at the Ankor Wat temple, Mr Shaw said.
The countryside will be flat, a change from the hilly East Otago coast roads the couple train on.
The couple have long supported World Vision and sponsored children through the charity.