The government of Kenya set aside the land in 1976 as an order to protect the
swampy forests of the Lower
Tana River and two endangered primates, the
Tana River mangabey and the
Tana River red colobus, that are found there. The endangered primates inhabit sixteen patches of forest (ranging from .1 to 6.25 km2) which extends for 60 km down the meandering lower Tana River, between
Nkanjonja and
Mitapani. have been largely ineffective.
De-protection In 2007, the
High Court of Kenya ruled that the reserve had not been properly established according to Kenyan law. As a result, the reserve was degazetted and disestablished, removing all official protection for the area and its National Reserve status and funding. == Habitat ==