The name roughly translates as 'Black Sand Creek', based on the accumulation of black iron ore which traditionally flowed down from the Ma On Shan peak.
Wu Kai Sha (including Cheung Kang) is a recognized village under the New Territories Small House Policy.
The area was once home to the largest of the detention centres for Vietnamese boat people in Hong Kong.
Many residents and visitors took kaito boats from Ma Liu Shui, near the MTR University station, across Tolo Harbour to the area.
With the extension of the new town to the northwestern side of Ma On Shan, roads were extended and expanded.