Bo District is a district in the Southern Province of Sierra Leone. It is the second most populous District in Sierra Leone (after the Western Area Urban District). Its capital and largest city is the city of Bo, which is the second largest city in Sierra Leone. other major towns in the district include Baoma, Bumpeh, Serabu, Sumbuya, Baiima and Yele. Bo District borders Kenema District to the east, Tonkolili District to the north, Moyamba District to the west, Bonthe District to the southwest and Pujehun District to the south. Bo District occupies a total area of 5,219 km² and is subdivided into fifteen chiefdoms.