Kambia District is a district in the Northern Province of Sierra Leone. Its capital and largest city is the town of Kambia. As of 2010, The District has a population estimated at 313,765. Kambia District borders the Republic of Guinea to the north, Port Loko District to the south and Bombali District to the east. The district provides an important Trade route to or from the Sierra Leonean capital Freetown to the Guinean capital Conakry.