Māori-Crown Relations Minister Kelvin Davis said his office had driven the project, with the blessing of the Cooper whānau, as a way of celebrating Aotearoa's Māori heroes.
"It's an apt way to commemorate Dame Whina. It's 45 years since the Land March, and it's a wonderful occasion, not just for North Hokianga but all of New Zealand," he said.
Te Rarawa chairman Haami Piripi said Dame Whina had helped shape legislation relating to Māori, and played an important part in community development in Auckland, but it was in the land march that she "really hit her straps," winning the heart of the nation, Māori and Pākehā.
"She was responsible for the phrase 'Not one more acre.' If there was a single slogan that slowed down the loss of Māori land, it was that one. It became a catch-cry for all of us.
"To galvanise the Māori nation into a march that large and that significant was really an awesome legacy," Mr Piripi said.
A flagpole carved by Dame Whina's son-in-law, Moka Puru, and carried on the 1975 march, which tradition dictates must not touch the ground until all Māori land is returned, was carried by Moka's son, George Puru.
Dame Whina died in 1994, aged 98.