A tramper camping in the area hiked to a nearby field base to report the stranding to DOC at 10.30pm on Saturday.
Across a period of several days past year, more than 650 pilot whales beached themselves on a thin strip of land projecting off New Zealand's South Island.
The remaining whales were euthanised due to their deteriorating condition and the remote, hard access to the location.
According to a Department of Conservation (DOC) spokeswoman, the whales were discovered by walkers late Saturday, scattered along the beach of Mason Bay.
DOC has notified local Ngāi Tahu iwi and is working together on next steps. In fact, most strandings remain a mystery but wildlife experts say sickness, falling tide, extreme weather and being chased by a predator could contribute to beaching whales.
Awarua Rūnanga Dean Whaanga said it was a sad event, especially given the large number.
Image The whales were in a very remote location. Pic Dept of Conservation
In a separate incident, 12 pygmy whales became stranded on 90 Mile Beach on New Zealand's North Island.
Half of the whales, from two different pods, survived the stranding, but with no prospect of being re-floated the Department of Conservation (DOC) said that they had made the "heart-breaking" decision to euthanize them.
The Department of Conservation responds to an average of 85 strandings per year, officials said, but most of the time this only involves a single animal.
Pilot whales strand in their hundreds because their social bonds make them reluctant to leave even one member of their family behind, Prof Slooten said.
Two have since died while efforts are being made to re-float the remaining eight, CNN reported.
The tragic incident took place on Stewart Island - also known as Rakiura - to the south of New Zealand's South Island.
As New Zealand conservationists were facing one disaster on Stewart Island, a thousand miles to the north another whale stranding event was unfolding.
What will happen to the stranded whales on Steward Island?
Mumbai remembers 26/11 martyrs on 10th anniversary of attacks
The Taj Mahal Palace and Tower Hotel will hold a private service to remember the 31 people who died there. Indian security forces only retook control of the hotel on the morning of November 29.
Read Dead Online LAUNCHES This Tuesday
It's still early days, but it'll be very interesting to see how Red Dead Redemption 2 develops as Online becomes an influence. In other words, you may have to wait until Saturday to jump in if you put off buying the game in the first place.
Border Patrol: 42 arrested for illegally crossing US-Mexico border
Across the border, migrants can be seen running near a pedestrian bridge in Tijuana. Doctors released them to the custody of U.S. Border Patrol agents, officials reported .