Nairobi is the capital and largest city of Kenya, located in the south-central part of the country. As of 2026 estimate, it has a population of 6.1 million people in the city proper(county boundaries) and a metro population estimate of 14.3 million consisting of Nairobi+Kiambu+Kajiado+Machakos+Parts of Muranga County, making it the 11th most populous city in Africa. Nicknamed the “Green City in the Sun,” Nairobi is uniquely notable for being the only capital city in the world that hosts a national park within its boundaries. Its name originates from the Maasai phrase Enkare Nyirobi, meaning “place of cool waters."