The Ang Trapaing Thmor Crane Sanctuary is a protected area of Cambodia on the site of a large Khmer Rouge irrigation project built during the 1970s. The sanctuary was gazetted on 1 January 1999 and covers an area of 10,250 hectares. The reserve was set aside to protect the rare Eastern Sarus Crane (Grus antigone sharpii). Prior to the discovery of the crane at Trapaing Thmor, there were thought to be fewer than 1,000 of the birds left alive in the world.[3]