Mombasa is a city on the coast of Kenya. It is the country's second-largest city, after the capital Nairobi, with an estimated population of about 1.2 million people in 2016., and is followed by Kisumu which is the country's third largest city with an estimated population of over 1 million people in 2017. Its metropolitan region is the second largest in the country and has a population of approximately two million people. Administratively, Mombasa is the county seat of Mombasa County. A regional cultural and economic hub, Mombasa has an extra-large port and an international airport, and is an important regional tourism centre. Located on the east coast of Kenya, in Mombasa County and the former Coast Province, Mombasa's situation on the Indian Ocean made it a historical trading centre, and it has been controlled by many countries because of its strategic location.