Which regions of Brazil are the most sparsely populated?

The most sparsely populated regions of Brazil are primarily found in the northern part of the country, particularly in the Amazon rainforest area. States like Acre, Roraima, and Amapá have low population densities due to their vast, dense jungles and limited infrastructure. Additionally, parts of the central-west region, such as Mato Grosso and Mato Grosso do Sul, also feature sparse populations, largely due to their expansive agricultural land and natural reserves.