Your post made me try to find a map of the areas covered under Treaty. While I'm familiar with Treaty 8, 7 and 6 and was aware of the Nisinga Treaty trying to find a map of all of them together is a challange.
This is the best one I found so far:
The Treaty Map The Yellowhead Treaty Map is an accessible introduction to Indigenous perspectives on treaties in Canada. It describes the context, negotiation process and terms of treaties – as well as the implications of failing to honor them. Check out the About page to learn more about each...
treatymap.yellowheadinstitute.org
There is also sigificant work going on in BC with many other communities:
Explore the BC region on your journey to learn about treaties in Canada. An initiative of The Gordon Foundation.
understandingtreaties.ca
End of the day when I look from Treaty 8 in NE BC towards the Nisinga Treaty lands in NW BC....it's a relatively small gap of divided opinions and a much small group of bands than the rest of the province. And that's where the duty to consult and if required, compensate for impacts, rests.