 Nyorai kupfuurira kweiyi ndima - Chibvumirano cheMadhaka, rakasainwa muRamsar muna 1971, chibvumirano chehurumende dzakawanda chinopa hurongwa hwezviito zvemunyika pamwe nekubatana kwenyika dzakawanda kuitira kuchengetedza uye kushandisa zvine hungwaru nzvimbo dzine mvura nemari dzadzo. Pari zvino pane Mapato Anobvumirana 160 kuCongress, ane nzvimbo dzine mvura dzine 1920, dzinokwana, dzakasarudzwa kuti dzibatanidzwe muRamsar List of Wetlands of International Importance. 