UNESCO deems the area to have “Outstanding Universal Value”:
On the south banks of the Hong River in the mountainous terrain of southern Yunnan, the Honghe Hani Rice terraces cascade down the towering slopes of the Ailao mountains. Carved out of dense forest over the past 1,300 years by Hani people who migrated here from further to the north-west, the irrigated terraces support paddy fields overlooking narrow valleys. In some places there are as many as 3,000 terraces between the lower edges of the forest and the valley floor.
A gorgeous gallery of photos on the ground here.