Sorry, yes as mentioned below Prince Edward Island aka PEI. We in PEI along with the Northwest Territories NWT also don't border any other nation. BC, Alberta

Sorry, yes as mentioned below Prince Edward Island aka PEI. We in PEI along with the Northwest Territories NWT also don't border any other nation. BC, Alberta, Saskatchewan, Manitoba, Ontario, Quebec, New Brunswick, Nova Scotia, Yukon all border the USA. Newfoundland and Labrador has a border with Greenland/Denmark, France. Nunavut borders Greenland/Denmark.