Koidu, located in Sierra Leone, serves as the capital of the Kono District and is a pivotal center for diamond mining in the region. With a population of approximately 124,662, it plays a significant role in the local economy and culture. The city is situated in the eastern part of the country, surrounded by lush landscapes and rich natural resources, making it an essential hub for both commerce and tourism.

Koidu was established during the late 19th century and quickly became known for its diamond deposits. Its historical significance is tied to the diamond trade, which has shaped its development and economy.

Koidu's economy is primarily driven by diamond mining, which attracts both local and foreign investment. In addition to mining, agriculture and small-scale businesses contribute to the economic landscape, providing employment and supporting the community.

Tourism in Koidu is centered around its natural beauty and cultural heritage. Visitors can explore the surrounding forests, engage with local communities, and learn about the diamond mining process. Attractions like the Kono District Museum offer insights into the region's history and traditions.