Two areas of very sparse population in Nigeria are?

The two areas of very sparse population in Nigeria are the Niger Delta and parts of Niger State, and Kano and parts of Borno State. The Niger Delta is a region in southern Nigeria where the Niger River empties into the Atlantic Ocean. It is sparsely populated because much of the land is covered by swamps and mangrove forests, making it difficult for people to live and farm there. Additionally, the region has experienced significant environmental degradation due to oil exploration and spills, which has led to a decline in agricultural productivity and forced many people to leave. Kano is a state in northern Nigeria that is also sparsely populated in some areas, as well as parts of Borno State. This is due to the region's arid and semi-arid climate, which makes it difficult for people to grow crops and raise livestock. Additionally, the area has been affected by conflict and insecurity in recent years, which has further reduced the population in some areas.