Earlier in this unit a mention was made of geological diversity as well as ecological diversity. Before we leave the marine parks, their rocky shores and island habitats, a brief consideration of another natural resource for which Hong Kong is famous: the geology! Some of my friends and colleagues in the Geotechnical Engineering Office were attracted to Hong Kong because of its geological diversity. This diversity can make for substantial town planning challenges. Happily, it also contributes, in some spectacular and beautiful ways, to another type of environmental appreciation known as geotourism: welcome to the geo-delights of Tung Ping Chau and Hoi Ha Wan.