• There are 17 nature reserves in the city of Johannesburg • There are 12 river systems that run throughout the city • There are six million trees in Johannesburg (1.2 million in parks and pavements, and 4.8 million in private homes) • Forty percent of all the world's human ancestor fossils have been found in areas adjoining the city • Johannesburg has about 150 heritage sites, half of which are national monuments • There are 4 443ha of open veld • There are 63ha of bird sanctuaries • There are 87ha of nature trails • There are 80ha of botanical gardens • There are 106 dams
