Well, CIHI thought so much of it, they put it in the opening paragraph of this report:
Health expenditure per capita varies among provinces/territories because of different age distributions. xii Population density and geography also affect health expenditure, particularly in the case of the territories.
https://secure.cihi.ca/free_products/4.0_TotalHealthExpenditureProvTerrEN.pdf
Canadian Foundation for Healthcare Improvement:
Spending is much higher in the territories than in the provinces, reflecting stark differences in geography, population density, healthcare needs, and delivery models.
http://www.cfhi-fcass.ca/SearchResultsNews/10-02-10/42054d49-16fb-4764-be05-1d03e6ff3bbb.aspx
Canadian Centre for Policy Alternatives
The challenges facing a proposed National Health Care System include: 1) Canada's distinctive geography and demography; 2 )Canada's history and social conditions; 3) the accelerating rate of growth of Canada's health care spending; and 4) its sustainability.
- See more at: https://www.policyalternatives.ca/publications/monitor/real-crisis-medicare#sthash.6kkWI5Cu.dpuf
They all seem to feel it's important, but it's hard to come up with numbers.