Another interesting coincidence Anon. Look who visited the area in 1972.
"In 1964, explorer parachutist Jean Poirel from Montreal jumped at its source (Nahanni River) 500 km (310 mi) north of Yellowknife, followed by his teammate Bertrand Bordet. Jean Poirel imagined the idea of going down the river with inflatable dinghies. During the following four consecutive expeditions in the valley Jean Poirel discovered more than 250 caverns. The most important contained 116 Dall sheep’s skeletons (carbon-14 dated to 2500 years BC); He took topographic notes and drew detailed maps, paving the way for the park's creation.
During his last expedition in 1972, he escorted Pierre Trudeau, who came in person to evaluate this superb and fascinating region.[16][17]
Park history
Originally established in 1972, by then Prime Minister Pierre Elliot Trudeau ,[2] the park was 4,766 km2 (1,840 sq mi) in area."
https://en.wikipedia.org/wiki/Nahanni_National_Park_Reserve>>5514450