Mountain Lions are mostly found in Northern Ontario. It lives in undisturbed forests or other natural areas where there's little human activity. The group of organism that mountain lions are found under would be lions. As you can see in the picture above, the green dots represent where mountain lions are mostly found. Its mostly found in Ontario and also a few in Southern Quebec. Mountain lions are Canada's largest and most powerful wildcat. They are also known as cougars or pumas.