Srimad Bhagavatam Canto 08, Chapter 15, Text 14

SB 8.15.14

akasa-gangaya devya
 vrtam parikha-bhutaya
prakarenagni-varnena
 sattalenonnatena ca
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The city was surrounded by trenches full of Ganges water, known as Akasa-ganga, and by a high wall, which was the color of fire. Upon this wall were parapets for fighting.

 

Srimad Bhagavatam Canto 08, Chapter 15, Text 13
Srimad Bhagavatam Canto 08, Chapter 15, Text 15