Text 15

arjuna uvaca
pasyami devams tava deva dehe
sarvams tatha bhuta-visesa-sanghan
brahmanam isam kamalasana-stham
rsims ca sarvan uragams ca divyan

Translation

Arjuna said: My dear Lord Krishna, I see assembled in Your body all the demigods and various other living entities. I see Brahma sitting on the lotus flower, as well as Lord Shiva and all the sages and divine serpents. 

Commentary by Srila Prabhupada 

Arjuna sees everything in the universe; therefore he sees Brahma, who is the first creature in the universe, and the celestial serpent upon which the Garbhodakashayi Vishnu lies in the lower regions of the universe. This snake bed is called Vasuki. There are also other snakes known as Vasuki. Arjuna can see from the Garbhodakashayi Vishnu up to the topmost part of the universe on the lotus-flower planet where Brahma, the first creature of the universe, resides. That means that from the beginning to the end, everything could be seen by Arjuna, who was sitting in one place on his chariot. This was possible by the grace of the Supreme Lord, Krishna.

Commentary by Sri Visvanatha Cakravarti Thakur

I see a multitude of viviparous animals (bhuta visesa) and Brahma situated on Mount Meru at the center of the lotus of the earth planet.