What journey is Dante referring to?

The journey that Dante refers to in his Divine Comedy, specifically in the first part, Inferno, is the journey through the realms of the dead, consisting of nine circles of Hell, each representing a different level of sin and punishment. Dante, guided by the Roman poet Virgil, descends through these circles observing and encountering various sinners and their torments. Through this journey, Dante reflects on human morality and the consequences of sin, as he ultimately seeks to reach the highest level of Paradise, where he will experience the beatific vision of God.