The concept of a nocturnal park in Singapore was suggested in the 1980s by the former executive chairman of the Singapore Zoo, Dr Ong Swee Law. Constructed at a cost of S $ 63 million, the Night Safari was officially opened on 26 May 1994 and occupies 35 hectares (86 acres) of secondary rainforest adjacent to the Singapore Zoo and Upper Seletar Reservoir.

Answer this question based on the passage: where is the night safari located in singapore? OK. Let's think. My stream of consciousness:
The relevant information is: Constructed at a cost of S $ 63 million, the Night Safari was officially opened on 26 May 1994 and occupies 35 hectares (86 acres) of secondary rainforest adjacent to the Singapore Zoo and Upper Seletar Reservoir. The answer is adjacent to the Singapore Zoo and Upper Seletar Reservoir.