Nairobi is the largest city in Kenya and one of the five largest cities in Sub-Saharan Africa. It's situated in the south central part of the country. It was founded around the turn of the 20th century as a depot on the Ugandan Railway, a British colonial project which linked the interior of Africa to the Indian Ocean. Today, Kenya has a population of over 4 million. Many of these inhabitants live in abject poverty in vast urban slums, some of which you'll see from an aerial perspective in this drone video.