Bang Kachao is a large green area in close proximity to Bangkok and to the industrial district neighborhood. The government initiated conservation efforts to protect this valuable green area, widely regarded as the city's lungs, and founded “Garden amid the Metropolis” in 1991. As the expropriation policy to consolidate land as part of the program was not successful, the government opted for a voluntary land selling approach, together with efforts to help improve the quality of life of the local community and the environment. The first phase of the program was then successfully conceived during 1991–1999. In the second phase of the program, from 2000 to 2004, a Green Area Management Master Plan was developed by the Office of Natural Resources and Environmental Policy and Planning. A public park and botanical garden were built on a 148-rai land plot and was named Sri Nakhon Khuean Khan Park by His Majesty King Bhumibol Adulyadej. The park construction was finished in 1997. Currently, Nakhon Khuean Khan Green Area and Eco-management Center is under the supervision of the Royal Initiative and Special Project Bureau, The Royal Forest Department.