Bukit Timah Nature Reserve In Singapore is the important reserve. The Bukit Timah Nature Reserve is a small nature reserve, measuring only 1.64 sq. km, near the geographic center of the city-state of Singapore. It is on the slopes of Bukit Timah Hill and parts of the surrounding area. Despite its small size, it is considered one of the most "productive" pieces of nature - together with the neighbouring Central Catchment Nature Reserve, it houses over 840 species of flowering plants and over 500 species of fauna. Today, it is one of the largest patches of primary rainforest left in Singapore.