Hong Kong Geopark’s major geoattractions include well-outcropped rhyolitic volcanic hexagonal rock columns, of which the average diameter is 1.2 m and which are distributed over a land-and-sea area of 100 km2 in Sai Kung. The Geopark also has comprehensive sedimentary rock formations formed from the Devonian to the Paleogene (about 400 to 55 million years ago). It is integrated with diverse ecological resources such as mangroves, fung shui woods and coral communities and well-preserved Hakka walled-villages, fishing villages and historical relics such as temples that reveal the rich cultural heritage of the area, all combining to form the unique natural landscape of Hong Kong Geopark.
Hong Kong Geopark was officially designated as a National Geopark of China in 2009, and was renamed Hong Kong Global Geopark of China in 2011 when it was accepted as a member of the Global Geoparks Network. With the formalisation of the new “UNESCO Global Geopark” label, Hong Kong Geopark was renamed Hong Kong UNESCO Global Geopark in 2015.