Kono District is a diamond-rich district in the Eastern Province of Sierra Leone. Its capital and largest city is Koidu Town. The other major towns in the district include Motema, Yengema, Tombodu, Jaiama Nimikor and Sewafe,and kainkordu. The district is the largest diamond producer in Sierra Leone. The population of Kono District is 352,328. Kono District borders Kenema District to the southwest, The Republic of Guinea to the east,  Koinadugu District to the northeast and Kailahun District to the southeast. Kono District is divided into fourteen chiefdoms