Many people are envious of the beaches overseas, which are as crystal-clear as glass. Sai Kung, in fact, also has a glassy reservoir awaiting your visit. The section between Pak Tam Chung and Long Ke, albeit quite long, has a gentle slope and is therefore a somewhat comfortable start to a hike. Commanding the best view in this section is unequivocally the clear and blue High Island Reservoir, which was built in 1979, when some 400 Hakka villages had to move out to make way for the reservoir, whose mammoth scale was therefore self-explanatory. Breath-taking scenery, whether natural or manmade, is seen not only in the mountain but also along the seashore - the wooden footpath in the East Dam of High Island Reservoir, a cofferdam of some 7000 dolosse, s-shaped hexagonal rock columns, Po Pin Chau and the like. Upon the completion of this section, either opt to proceed forward or stay in Long Ke Wan Campsite. The coast along Long Ke Wan is known for a unique landscape of rhyolite, which is a kind of small volcanic rock and is formed in the course of the rapid and different cooling rates at the lava surface and bottom layer. You can appreciate the grey-brown hexagonal columns formed by rhyolite, or you can stay behind and revel in the Milky Way in the dark sky against the sound of swells, enjoying the beauty of Hong Kong from a different perspective.