Mich. Comp. Laws § 119.1: Metropolitan districts; purposes; body corporate.

Sec. 1.

Any 2 or more cities, villages or townships or any combination or parts thereof, may incorporate into a metropolitan district or districts comprising territory within their respective limits for the purpose of acquiring, owning, operating and maintaining either within or without their limits, as may be established hereunder, parks or public utilities for supplying sewage disposal, drainage, water or transportation or any combination thereof. Each organized district hereunder shall be a body corporate.