A mystery pipe-like object has washed up on a beach in New Zealand.

The 100-metre long black, plastic pipe was discovered on Te Waewae Bay, on New Zealand's south island, by a local police officer earlier in the week and notified local environmental council Environment Southland, the NZ Herald reported.

Deputy Harbourmaster Ian Coard said the object washed onto shore with an incoming tide.

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A 100 metre long and heavy plastic pipe has washed up on the Te Waewae Bay, on New Zealand's south island

A local environmental group has shared pictures on Facebook and have asked their followers to share their thoughts to help figure out what it is or who owns it

'We've been to check it out today and attempted to move it with a couple of people, but it didn't want to budge,' Mr Coard.

Environment Southland described the object as very heavy, made of some kind of plastic and with metal loops on each end.

Authorities are trying to figure out what it is and posted pictures of pipe on their Facebook asking followers to share their thoughts on what it is or who owns it.

One man said: '[It]looks like a length of welded polyethylene pipe with towing eyes on each end for directional drilling.'

Environment Southland described the object was very heavy, made of some kind of plastic and with metal loops on each end

Theories of what it is includes a flotation pen used in their fish and oyster farms, a boom to contain oil during spills at sea

One man commented on the post saying it could be a flotation pen used in their fish and oyster farms, while other users have suggested it could have been used salmon farmers in Tasmanian.

However, plenty of people agreed that it was boom that contained oil during spills at sea.

This comes almost a week after another bizarre item washed up on a New Zealand beach.

A passerby noticed strange, large object on Muriwai Beach near Auckland and shared pictures of it on social media.

She got plenty of theories about what it could possibly be, including a Maori canoe, a shipwreck, artwork, Caribbean walrus or an alien time capsule.

But experts said it was just a large piece of driftwood covered in gooseberry barnacles.

The other week another large and strange object washed up on Muriwai Beach near Auckland

People on social media said it could possibly be a Maori canoe, a shipwreck, artwork, Caribbean walrus or an alien time capsule