Geology
The Sai Kung Peninsula and the islands near the coast are almost composed entirely of volcanic materials. Coarse tuffs are found in the northern and south-western parts of the Peninsula and Tap Mun area. Pyroclastic rocks with some lava are found in the eastern part of the Sharp Peak and Sham Chung areas. Acid lavas are found in the area surrounding the High Island Reservoir and the south islands such as Kau Sai Chau, Tiu Chung Chau and Basalt Island, Banded acid lava with some welded tuffs are found in the central and southern shore of Pak Tam Chung area.
The most spectacular of all are the hexagonal columnar joints which are found near the east dam of the High Island Reservoir and Po Pin Chau area. They are the results of the uniform cooling of tuff. This natural landscape is complemented by the nearby gigantic water works.
Along the south-eastern coast and on the offshore islands that are exposed to the easterly winds and sea waves, interesting landforms such as sea caves, stacks, arches and inlets add to the beauty of the natural landscape.
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