The city (of Indra) 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

Expressions researched:
"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"

SB Canto 8

The city was surrounded by trenches full of Ganges water, known as Ākāśa-gaṅgā, and by a high wall, which was the color of fire. Upon this wall were parapets for fighting.

SB 8.15.14, Translation:

The city was surrounded by trenches full of Ganges water, known as Ākāśa-gaṅgā, and by a high wall, which was the color of fire. Upon this wall were parapets for fighting.