Manukau City Council says people do not realise the extreme danger posed by a large slip that is on the verge of collapse at Kawakawa Bay.
The slip has forced the closure of the main northern access road. Five houses below the slip and one above it have been evacuated.
The council says the slip is still moving and the hillside could come down at any time, along with thousands of tonnes of earth.
It says people do not realise the extreme danger posed by the slip.
Economic director Rick Walden says people are continuing to access the area and are ignoring security guards posted at the site.
He says the slip still poses a serious risk: the back is moving at a consistent pace, while the front of it is acting as a dam, which he describes as the real hazard.
Geo-technical engineers and land surveyors continue to monitor the site on Sunday.
Kawakawa Bay is in eastern Manukau. About 1,500 people living in the area now have to take an alternative route to Auckland city, which adds an hour and a half to the journey.
Road closed
The council on Friday blocked vehicle access to the area and removed workmen from the site for their own safety.
It also expressed concern about people walking along the foreshore road despite warnings to stay away.
It says the hillside looks deceptively calm but is very unstable.
The council expects the road to be closed for up to a month.
The council is starting a ferry service from Kawakawa Bay to Pine Harbour marina on Monday morning. An additional bus service is also being provided.
