Christchurch's mayor is urging anyone who objects to an Otakaro Avon-Corridor option to speak up.

Regenerate Christchurch has released ten concepts for the development the 600 hectares of land.

One of those options involves building new homes, despite residents being forced off the land following the 2010-2011 earthquakes.

Mayor Lianne Dalziel says if you don't like the idea let Regenerate Christchurch know.

She says the ten options are about finding what's best for the city.

"This is the best opportunity our city will ever have in terms of the extensive regeneration opportunities that exists in an area four times the size of Hagley Park."

Regenerate Christchurch has released the choices, which cover a combination of residential use, flat-water sports facilities, visitor attractions, ecological restoration, or using the land for agricultural and horticultural purposes.

The Crown purchased thousands of properties from owners in the red zone after the Christchurch earthquakes.

Regenerate Christchurch chief Ivan Iafeta says at this stage, the organisation wants to know what people think of the possible combinations, before refining them into a shortlist.

More than 5000 ideas were submitted on the future use of the Otakaro Avon River Corridor Regeneration Area.

"A wide range of exciting possibilities remain on the table," he said.

"We are approaching another decision that will shape the future of our city for hundreds of years and influence how people experience life in Christchurch for generations to come."

All 10 combinations feature an open, green corridor of up to 150 metres on either side of the Otakaro Avon River, where the space could include permanent paths, trails, gardens, forest, wetlands and community initiatives.

At 602 hectares, the regeneration area is three-and-a-half times the size of Hagley Park.

"Our goal is to determine how the area can make the biggest contribution to Christchurch and New Zealand's future," Mr Iafeta said.