National borders are a hodgepodge of lines criss-crossing along some imaginary path across land and water. Their location usually relates to some maximum extent carved out by some long-gone warlord or a thoughtless attempt by colonial powers to maximize economic return. The living resources never influenced the segmentation. Whether desert, plain, glacier or swamp, once a line was drawn, administrative duties got allocated.
Our fellow living beings that share Earth with us pay little heed to national borders. Mobile life forms; animals, birds and insects all journey to where they have the best chance for survival. They need energy and any good source of energy draws them near. More sedentary life forms; trees, fungi and kelp stay in one location however their progeny can disperse far and wide. No administrative boundary keeps them constrained.
People could acknowledge their dependence upon other living beings. Watersheds naturally define self-contained little areas(1). Water is a common element for survival of both plants and animals. By using watersheds as administrative districts, people would clearly see the consequences of abusing the ecosystem, whether from over consumption or through violation via pollution. More importantly, determining and maintaining a sustainable level of energy extraction would be facile.
(2) US watersheds
Global Watersheds/Drainage Basin 
Canada’s Drainage Basin/Watersheds
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