^^ My family cottage is located right in that white hole between Ottawa & Toronto. For quite a long time now that has been the last remaining part of Southern Ontario without cell coverage. It's nearly devoid of inhabitants--the density is around 1-2 people per square kilometre or possibly even less. The largest community in there is Cloyne, Ontario, with a population of less than one hundred. It roughly corresponds to the big green mass here:
https://www.google.com/maps/@44.7997.../data=!3m1!1e3