Throughout much of Canada, there are at least two routes designated as part of the Trans-Canada Highway (TCH). For example, in the western provinces, both the main Trans-Canada route and the Yellowhead Highway are part of the Trans-Canada system. Although the TCH does not enter any of Canada's three northern territories, the Trans-Canada Highway forms part of Canada's overall National Highway System, providing connections to the Northwest Territories, Yukon and the Canada–US border where connections can be made to the United States.