Birnin Kebbi is a city located in northwestern Nigeria. It is the capital city of Kebbi State and headquarters of the Gwandu Emirate. As of 2007 the city has an estimated population of 125,594. Kebbi is mostly Hausa and Fulani state, with Islam as the major religion. Formerly it was the capital of the Kebbi Emirate, which relocated to Argungu after the conquest by Gwandu in 1831.