Siuna is a county-sized administrative municipality and a city in Nicaragua, located approximately 318 kilometres (198 mi) northeast of the capital city of Managua and 218 kilometres (135 mi) west of the coastal city and regional capital Bilwi in the North Caribbean Autonomous Region. Siuna is the name of the city as well as the municipality. The municipality of Siuna contains 204 rural communities and 20 neighborhoods. Most were settled in support of gold mining along the Ei River drainage basin, leading to rapid population growth from the mid-1930s.