"in parts of the southern Okanagan and lower Similkameen regions.". "In parts of" sound weird. Try to use a better wording for it. [you may like to use "Inside"]
I don't understand completely the first sentence on the second paragraph. I mean, i think you need to expand a bit about from where trhat deffinition comes and so.
Also, why the policy was amended? could you add a bit about it?
I have a little issue with the last sentence from the second paragraph: From what I read, it seems a bit useless or written more like an advert than an encyclopedic statement. Affirmations such as "recognize the importance of" gives me that feeling.