[3][4] The Central Catchment Nature Reserve and the nearby Bukit Timah Nature Reserve are the stronghold of the remaining forest animals on the mainland.
These enclose the only remnants of primary forest on the island.
The former includes four reservoirs (MacRitchie, Upper Peirce, Lower Peirce, Upper Seletar).
The northeastern offshore islands of Pulau Ubin and Pulau Tekong are also rich in wildlife.
Other areas of note are Sungei Buloh Wetland Reserve, Singapore Botanic Gardens, Bukit Batok Nature Park, Pulau Semakau, etc.