Hung Shui Hang Reservoir, Irrigation reservoir in New Territories, Hong Kong

Hung Shui Hang Reservoir, also called Tan Kwai Hang Reservoir, lies north of Kau Keng Shan at the northwestern edge of Tai Lam Country Park, less than a kilometre east of Lam Tei Reservoir. It is an irrigation reservoir split into an upper and a lower pond, close to Lam Tei Quarry.

Hung Shui Hang Reservoir, also called Tan Kwai Hang Reservoir, is an irrigation reservoir forming part of Tai Lam Chung Reservoir's further water supply plan, like nearby Lam Tei Reservoir. It lies at the northwestern edge of Tai Lam Country Park, north of Kau Keng Shan in Tuen Mun, less than a kilometre east of Lam Tei Reservoir. Its water flows through Tan Kwai Tsuen and Chung Uk Tsuen, then through Hung Shui Kiu and past the west side of Tin Shui Wai into Deep Bay.

The reservoir is an irrigation reservoir, not a drinking-water supply, and its water flows through Tan Kwai Tsuen and Chung Uk Tsuen before reaching Hung Shui Kiu and Deep Bay. The stream it feeds is known locally as the "stinky river". The site is remote, with no picnic facilities, so it is rarely visited even on holidays.

The reservoir lies north of Kau Keng Shan at the northwestern edge of Tai Lam Country Park, less than a kilometre east of Lam Tei Reservoir. It is remote and hard to reach, close to Lam Tei Quarry, and has no picnic facilities nearby, so few people come even at weekends.

Hung Shui Hang Reservoir is an irrigation reservoir, not a drinking-water supply: its outflow runs past Tan Kwai Tsuen and Chung Uk Tsuen, through Hung Shui Kiu and along the west side of Tin Shui Wai before reaching Deep Bay. In that lower stretch the stream is known locally as a foul-smelling river.