Nairobi fought fiercely to save the indigenous Karura Forest in northern Nairobi which was under threat of being replaced by housing and other infrastructure. Nairobi's western suburbs stretch all the way from the Kenyatta National Hospital in the south to the UN headquarters at Gigiri suburb in the north, a distance of about . The city is centred on the City Square, which is located in the Central Business District. The Kenyan Parliament buildings, the Holy Family Cathedral, Nairobi City Hall, Nairobi Law Courts, and the Kenyatta Conference Centre all surround the square. Under the Köppen climate classification, Nairobi has a
Nairobi transferred from the metre-gauge trains to the CBD. Nairobi is served by highways that link Mombasa to Kampala in Uganda and Arusha in Tanzania. These are earmarked to ease the daily motor traffic within and surrounding the metro area. However, driving in Nairobi is chaotic. Most of the roads are tarmacked and there are signs showing directions to certain neighbourhoods. The city is connected to the Jomo Kenyatta International Airport by the Mombasa Highway, which passes through Industrial Area, South B, South C and Embakasi. Ongata Rongai, Langata and Karen are connected to the city centre by Langata Road, which