Following the encounter with Lucifer, Dante and Virgil find themselves in a dark place recognizable by the sound of a stream, the Lethe, the river of forgetfulness. Without resting, the travelers follow the river to return to the world of light.
Canto XXXIV, 127-132
A place there is below, from Beelzebub As far receding as the tomb extends, Which not by sight is known, but by the sound
Of a small rivulet, that there descendeth Through chasm within the stone, which it has gnawed With course that winds about and slightly falls.
Canto XXXIV, 133-139
The Guide and I into that hidden road Now entered, to return to the bright world; And without care of having any rest
We mounted up, he first and I the second, Till I beheld through a round aperture Some of the beauteous things that Heaven doth bear;