Section 5 of the trail begins at Wong Nai Chung Reservoir.  The construction of the reservoir was one of the measures to improve water supply resources in the wake of the outbreak of plague in 1894.  Completed in 1899, the reservoir was originally operated as an ancillary water source to the Tai Tam Group of Reservoirs but later rendered superfluous by several larger reservoirs in the 1960s.    Its surviving waterworks construction including the dam, the valve house, and the weir are classified as declared monuments.  Section 5 of the Hong Kong Trail stretches for 4 kilometres only, but is steeply undulating, leading up to the summit of Jardine’s Lookout and the summit of Mount Butler.  The two summits afford some of the best views of Hong Kong – the former, at an elevation of over 400 metres, commands sweeping vistas of Victoria Harbour and downtown Kowloon, while the latter overlooks Lamma Island, Tai Tam Bay, and Stanley in the southern part of Hong Kong Island.  Alternating between climbs and descents, the trail ends with a flight of 599 steps, make sure you are physically and mentally fit to complete this section!