Legendary zoologist and TV star Sir David Attenborough is set to open the new Woodberry Wetlands Centre on Saturday 30 April.
With the exception of a path that runs along its west side, the area has been closed to the public since its construction in 1833.
The centre, which will be free to visit, opens for the first time on Sunday 1st of May.
Described as setting “a new bar for 21st century nature conservation” the 11 hectare site will provide “an inspirational showcase for the value of nature to people living in the heart of high-rise London”.
The centre has been under development for the past 6 years, with 13,000m² of reed beds being planted along with 550m² of hedgerow.
The site is owned and managed by Thames Water, and sustainability director Richard Aylard said: “Our reservoirs play a vital role in supplying drinking water to millions of customers and it’s wonderful that they can do this while also providing a haven for wildlife.”
According to a press release from the London Wildlife Trust, which manages the site, the centre will attract “birds, bees, butterflies and other insects” as well as becoming an “attraction for people too”.
Stephanie Hillborne OBE, Chief Executive of the Wildlife Trust, said: “These are natural places that people can enjoy day after day – and in urban areas they are particularly valuable.”
“Woodberry Wetlands is the inspirational outcome of years of dedicated effort and a great partnership with Thames Water,” she added.