With a land mass of 147.16 square kilometres (56.82 sq mi), it is the largest island in Hong Kong, almost twice the size of Hong Kong Island. Lantau Island primarily consists of mountainous terrain. Lantau Peak (934 metres (3,064 ft)) is the highest point of the island. It is the second highest in Hong Kong, after Tai Mo Shan, and is almost twice the height of Victoria Peak. Other mountains include Sunset Peak at 898 m (2,946 ft), Lin Fa Shan at 766 m (2,513 ft), Nei Lak Shan at 751 m (2,464 ft) and Yi Tung Shan at 747 m (2,451 ft).
Lantau Island is often referred to as “the lungs of Hong Kong”, because of its abundance of indigenous forest and a relative scarcity of high-rise residential developments which characterise Hong Kong Island and Kowloon. The largest country park of Hong Kong, Lantau South Country Park is located on the island, which hosts two other parks, namely Lantau North Country Park and its extension. These parks cover slightly more than half of the area of Lantau Island.