Dease Plateau
The Dease Plateau is a sub-plateau of the larger Yukon Plateau , and is located in far northern British Columbia , Canada , northwest from the Deadwood River to and beyond the Yukon-British Columbia boundary . 
<triplet> Yukon Plateau <subj> sub-plateau <obj> instance of <triplet> British Columbia <subj> Yukon <obj> shares border with <triplet> Yukon <subj> British Columbia <obj> shares border with