“Sauti said, ‘There is a mountain called Mandara adorned with cloud-like peaks. It is the best of mountains, and is covered all over with intertwining herbs. There countless birds pour forth their melodies, and beasts of prey roam about. The gods, the Apsaras and the Kinnaras visit the place. Upwards it rises eleven thousand yojanas, and descends downwards as much.
In plain words: Sauti describes Mount Mandara, a huge mountain with cloud-like peaks, covered in plants, full of birds and wild animals. Gods and heavenly beings visit it. It rises eleven thousand yojanas high and goes just as deep below.