Agencies in charge of regenerating Christchurch's red zone say good progress is being made but some are worried there's still no clear plan of action for the space. Pathways, public facilities, landing sites and the restoration of ecological areas are proposed for the Ōtākaro Avon River Corridor. Photo: Supplied / Regenerate Christchurch The Ōtākaro Avon River Corridor (OARC) red-zone is 600 hectares in size, about four times the size of Hagley Park or Auckland's Cornwall Park. The red zone housed 9000 people before the Christchurch earthquakes in 2010 and 2011. If you walk through the area now it is mostly grass where houses once stood with their established gardens still intact.