The plan for the Brook Waimārama included a predator-proof fence, to prevent reinvasion by introduced predatory mammals after eradication had been completed.
A resource consent for the fence was secured in 2009, and the fence route surveyed in 2010.
The area to be protected was three times the size of Zealandia, with a fence twice as long – the largest wildlife sanctuary in the South Island, and the second-largest in New Zealand.

The predator-proof fence was finished in September 2016 after 12 years of planning and 18 months of construction.
The fence is 14.4 km long, and cost $4.2 million.
In addition to the Nelson City Council and Tasman District Council funding, $574,000 was raised in donations (including a one-off anonymous donation of $250,000), and the remaining $1.75 million came from a Lottery grant.
An electric wire runs the length of the fence hood to detect when branches fall on it that might allow a predator to cross.
The plan for the Brook Waimārama included a predator-proof fence, to prevent reinvasion by introduced predatory mammals after eradication had been completed. A resource consent for the fence was secured in 2009, and the fence route surveyed in 2010. The area to be protected was three times the size of Zealandia, with a fence twice as long – the largest wildlife sanctuary in the South Island, and the second-largest in New Zealand.
The predator-proof fence was finished in September 2016 after 12 years of planning and 18 months of construction. The fence is 14.4 km long, and cost $4.2 million. In addition to the Nelson City Council and Tasman District Council funding, $574,000 was raised in donations (including a one-off anonymous donation of $250,000), and the remaining $1.75 million came from a Lottery grant. An electric wire runs the length of the fence hood to detect when branches fall on it that might allow a predator to cross.
Brook Waimārama Sanctuary