“You could try the southern insulae,” he said, “such as those below the Plaza of Tarns.”
“The Anbar district?” I asked, skeptically.
“Or those of the Metellan Quarter,” he said.
“What about east of the Avenue of the Central Cylinder?” I asked.
“There is the District of Trevelyan,” he said." 
"Mercenaires of Gor" page 260

 

“It was the same five days ago,” said one of the men, “with the five brigands found slain in the Trevelyan district, and the two mercenaries cut down on Wagon Street, at the second Ahn, only the bloody delka left behind, scrawled on the wall.” 
"Magicians of Gor" page 177

 

“You saw her mouth was uncovered,” he said. “She belongs with other lewd women in the loot pits of the Anbar district, awaiting their brands and collars.” 
"Magicians of Gor" page 190

 

"We were in a deserted alleyway, about two pasangs from the shop, rather between it and the Anbar district. It might well appear that we had been on our way to that district." 
"Magicians of Gor" page 190

 

"We were in a street of Ar, a narrow, crowded street, in which we were much jostled. It was in the Metellan district, south and east of the district of the Central Cylinder. It is a shabby, but not squalid district. There are various tenements, or insulae, there. It is the sort of place, far enough from broad avenues of central Ar, where assignations, or triflings, might take place. 
"Magicians of Gor" page 9

 

“It is here,” she said, after a long walk.
“In that tower?” I asked. We were on one of the lower bridges.
“Yes,” she said.
It seemed to soar to the clouds.
“You must be wealthy,” I said. We were in one of Ar’s finest residential districts, that of the seventeen Tabidian Towers.
She shrugged.
“Quite wealthy,” I said." 
"Mercenaries of Gor" page 426

 

"The Street of Brands, incidentally, can be a particular street, but, generally, as in Ar, it is a district, one which has received its name from its dealings in slaves, and articles having to do with slaves. In it, commonly, are located the major slave houses of a city." 
"Mercenaries of Gor" page 267