Lantau Island is the largest island with 147,16 square kilometres in Hong Kong, located at the mouth of the Pearl River. Administratively, most of Lantau Island is part of the Islands District of Hong Kong. A small northeastern portion of the island is located in the Tsuen Wan District.
Lantau Island primarily consists of mountainous terrain. Lantau Peak (934 metres) 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.
Lantau Island is often referred to as "the lungs of Hong Kong", because of its abundance of indigenous forest and relative scarcity of high-rise residential developments which characterise Hong Kong Island and Kowloon.