In a surprise move The Nature Conservancy (TNC) Australia has offered The Great Cumbung Swamp up for sale.

Touted as one of the largest remaining natural reedbed wetlands in NSW the joint properties of Juanbung and Boyong Stations are located 110 kilometres northwest of Hay and encompass 34,114 hectares.

It is expected the properties will attract offers over $60 million, which could nett TNC and partner Tiverton Agriculture more than a $5 million profit after four years of ownership.