The Singapore Zoo, formerly known as the Singapore Zoological Gardens or Mandai Zoo, is a 28 hectares zoo located on the margins of Upper Seletar Reservoir within Singapore's heavily forested central catchment area. Opened in 1973, the zoo was built at a cost of $9 million that was granted by the government of Singapore. It is operated by the Mandai Wildlife Group, which also manages the neighbouring Night Safari, River Wonders, Bird Paradise as well as the forthcoming Rainforest Wild Park.