Céu Azul is a municipality in the state of Paraná in the Southern Region of Brazil. Céu Azul covers 1,179.5 square kilometres, has a population …Céu Azul is a municipality in the state of Paraná in the Southern Region of Brazil. Céu Azul covers 1,179.5 square kilometres, has a population of 11,819, and population density of 9.35 resident per square kilometer. 852 square kilometres of the city is preserved as Atlantic Forest and is part of Iguaçu National Park.