Alpine trekking guide Laetitia Campe said the Matukituki Waterfall face was a particularly dangerous area.
"It is quite exposed, it is steep and we usually use ropes there. I would be quite happy on my feet but if I have people I use ropes just because of consequence. If you slip, then you go a long way," Campe said.
"It is very remote [so] consequences are severe. [Also] once you get down that face, it is a long way out. It is a long, long valley to follow."
Campe said climbers needed a "decent amount" of experience to negotiate the Waterfall face.
"If you don't know what you are doing and you make a mistake, I guess it can be fatal. It does get walked by individuals on their own terms, which is great, but you just need a certain amount of experience. It is in the wilderness area and you are very much on your own out there."
The woman's death was the third at Mt Aspiring National Park this year.
On January 4, Wellington tramper Scott Oliver, 42, drowned in the Wilkin River in Otago during a family tramping trip.
In a report released on Monday, Coroner David Crerar said Oliver, who was a fit but inexperienced tramper, appeared to have tripped on an obstruction or been knocked off his feet by the strong surging river.
His body was found 19 days later after it had been carried down the river.
Then on April 25, Allison Lynn Willen, a 20-year-old American tourist, drowned after falling into the Young River while tramping on the Gillespie Pass in the Mt Aspiring National Park.