In the context of The Long Dark, I'm afraid I have no idea. I've only encountered it as the name of an AI in William Gibson's Neuromancer.
Gibson has lived in Canada for many years and has written a short story titled "Hinterlands" (which happens to be one of my favorites of his), but I'm fairly certain that's just coincidence. I doubt there's any real connection between Gibson and TLD besides the name, but I guess I won't know for sure until after August 1st.
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