LLocated is in northeastern Liberia, Nimba County shares borders with the Republic of Côte d'Ivoire in the East and the Republic of Guinea in the Northwest. Its capital city is Sanniquellie and its most populous city is Ganta. With the county's area measuring 11,551 square kilometres (4,460 sq mi), Nimba is the largest of Liberia's 15 counties. The county has six statutory districts. As of the 2008 Census, it had a population of 462,026, making it the second most-populous county in Liberia
The main ethnic groups in Nimba County are the Dan, also known as Gio and the Mano. The Dan, commonly known as the Gio, live closer to the Cote d'Ivoire border. In that French-speaking country, they are known as the Yacouba. The Mano live closer to the Guinea border.