Many people, including Canadians, do not realize how inaccessible many parts of Canada is. Nahanni National Park in Northwest Territories has no roads to or within it, and the only ways to enter is by floatplane or by canoe/white-water raft.
As to how I got there, I drove approximately 622 kilometres from Wood Buffalo National Park to Fort Simpson in 2017. Almost to Fort Simpson, actually, as I missed the last ferry across Liard River and had to sleep in my car until the morning. After crossing into Fort Simpson the next morning, I got on a floatplane (Simpson Air) for a day trip to Nahanni National Park. A year after my trip, a Simpson Air flight that went on the same run that I did, crashed into a lake, and three tourists died.
Nahanni National Park is a breathtakingly beautiful, vast, and wild. Most floatplane day trip visitors will stop at immense Virginia Falls and tranquil Glacier Lake. Those who are healthy, experienced in wild rivers, and adventurous (and have time and money) will, I am sure, see much more unreal scenery by canoe/raft.