The area is accessed by Highway 20, which runs from the port town of Bella Coola, at the head of South Bentinck Arm, a coastal fjord piercing into the heart of the Coast Mountains, across the mountains and plateau to the city of Williams Lake, the principal town of the south Cariboo. Near Highway 20 in the southern end of Tweedsmuir Park is Hunlen Falls, at 1226 feet (373.7 m) one of Canada's highest, plunging into a deep canyon that makes measurement difficult.