A Canberra lawyer and his hiking companion had to climb a 60-degree scree slope as loose rocks cascaded away behind them after they went the wrong way trying to exit remote bushland.

William McCarthy and his friend, Wollongong woman Francisca Boterhoven De Haan, emerged from Morton National Park in good health on Friday, accompanied by emergency services workers after a search and rescue effort.

Francisca Boterhoven De Haan at a campsite she and William McCarthy set up during their six nights in Morton National Park. Photo: Supplied

They had set out last weekend on what was supposed to be a four-day hike to celebrate Ms Boterhoven De Haan's 60th birthday, but ended up spending six nights in the wilderness west of Nowra.

The pair told the Sunday Canberra Times that as they went to leave Ettrema Creek on what is known as Transportation Spur, they took the wrong exit and ended up on the southern side of Gallows Gully instead of the northern edge.