Johannesburg might be something of an urban jungle, but it also has some wonderful natural attractions, adding much to the fascinating nature of this city. The land on which Johannesburg is built was once grassland, but is now the biggest urban forest in the world, with over 10 million trees in its city, gardens, 600 parks, open spaces and suburbs. The Walter Sisulu National Botanical Garden in Kloofendal conserves a piece of the original grassland as well as succulents and ferns. It has over 120 bird species, including the only pair of nesting Verreaux’s (black) eagles in Johannesburg. The Johannesburg Botanical Gardens in Emmarentia is famed for its Rose Garden and the numerous waterfowl found in the reed beds of Emmarentia Dam (a great spot for an impromptu picnic). Another worthwhile spot is Suikerbosrand Nature Reserve on the way to Heidelberg: this reserve covers over 13 000 hectares and have excellent hiking trails as well as an abundant antelope and bird population. Just as close to the city centre are the Melville Koppies, hills where an Iron Age village and smelting works are to be found. You can enjoy guided walks in this undeveloped natural area.