The city of Warri is an oil hub in South-South Nigeria and houses an annex of the Delta State Government House. It served as the colonial capital of the then Warri Province. It shares boundaries with Ughelli/Agbarho, Sapele, Okpe, Udu and Uvwie although most of these places, notably Udu, Okpe and Uvwie, have been integrated to the larger cosmopolitan Warri. Osubi houses an airport that serves the city. Effurun serves as the gateway to and the economic nerve of the city.