Grand Bassa is in the west-central portion of Liberia. It has eight districts with Buchanan serveing as the capital with the area of the county measuring 3,064 sq. miles. As of the 2008 Census, it had a population of 224,839, making it the fifth most populous county in Liberia. Grand Bassa is bordered by Margibi County to the northwest, Bong County to the north, Nimba County to the east, and Rivercess County to the south and east. The western part of Grand Bassa borders the Atlantic Ocean. The port of Buchanan was constructed by LAMCO to serve the export of iron ore carried through the railway from Nimba.