In my eyes, this makes more sense than the Citizens United ruling. Via Care2:
In a landmark case for the Rights of Nature, officials in New Zealand recently granted the Whanganui, the nation’s third-longest river, with legal personhood “in the same way a company is, which will give it rights and interests”. The decision follows a long court battle for the river’s personhood initiated by the Whanganui River iwi, an indigenous community with strong cultural ties to the waterway.
Under the settlement, the river is regarded as a protected entity, under an arrangement in which representatives from both the iwi and the national government will serve as legal custodians towards the Whanganui’s best interests.
While it may seem an odd extension of rights, in many ways it harkens back to a time when mankind’s fate was more readily acknowledged as being intertwined with that of the rivers, lakes, and streams that sustained us.