Yukon Planning Regions are established by Yukon Land Use Planning Council under Yukon First Nation Final Agreements, Chapter 11. Boundaries are generalized from 1:250K Yukon First Nation Traditional Territories, and watersheds, settlement lands and other sources where necessary, and are provisional until agreed to by Yukon Government and the affected Yukon First Nations.
These boundaries reflect the Council's September 16th, 2011 recommendation, and have had minor updates up until December 2014. Note that the boundaries in southern Yukon continue to be refined. See the outcomes of a recent workshop on this here.