Koidu is a city located in the eastern part of Sierra Leone, serving as the capital of the Kono District. It is known for its rich deposits of diamonds, which have significantly influenced the local economy and history. The city has a population that primarily engages in mining and agriculture. The area around Koidu is characterized by lush landscapes and a tropical climate. The city has seen various developments in infrastructure and services, especially after the end of the Sierra Leone Civil War. Koidu continues to grow as a center for trade and commerce in the region.