Owerri is the capital city of Imo State in Nigeria, set in the heart of Igboland. It is also the state's largest city, followed by Orlu, Okigwe a…Owerri is the capital city of Imo State in Nigeria, set in the heart of Igboland. It is also the state's largest city, followed by Orlu, Okigwe and Ohaji/Egbema. Owerri consists of three Local Government Areas including Owerri Municipal, Owerri North and Owerri West, it has an estimated population of 1,401,873 as of 2016 and is approximately 100 square kilometres in area. Owerri is bordered by the Otamiri River to the east and the Nworie River to the south. The Owerri Slogan is Heartland. It is also called the Las Vegas of Africa, due to the night life of the city and the numerous hotels, casino and leisure parks all over the city.