A slip blocking a section of the popular Mangawhai Cliffs Walkway has forced the whole track's closure.

Part of the national Te Araroa Trail and considered one of New Zealand's best coastal walks, the spectacular track cliff, rocky coast and beach walk has suffered its second slip this year, closing it completely.

Last week a large slip covered the track at a particularly steep section towards the southern end.

The slip is highly unstable and crossing it should not be attempted, a Department of Conservation (DoC) spokeswoman said.

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A section of the northern end had been damaged by a slip in April this year and work was underway to divert about 100m of track around it.

Whangarei DoC visited the site last Thursday and a works officer and engineer have both been out on site this week.

Track closure signs have been installed and alerts added to the DoC website.

DoC is waiting on geotech engineer reports before it can make any decision on when the track may reopen.