About 23% of Singapore's land area are forest and nature reserves. Urbanisation has removed most primary rainforest, with Bukit Timah Nature Reserve the only significant remaining forest. Even though there is very little primary rainforest left, there are more than 300 parks and four nature reserves in Singapore. There are also many trees planted all over Singapore and almost fifty per cent of the country is covered by trees and plants. Because of this, Singapore is also commonly known as the 'Garden City'.