Welcome to Selnar

"There were the northern islands, of course, and they were numerous, but small, extending in an archipelago like a scimitar northeastward from Cos, which lay some four hundred pasangs west of Port Kar. But these islands were not united, and, indeed, the government of them was usually no more than a village council. They usually possessed no vessels more noteworthy than clinker-built skiffs and coasters.
---Raiders of Gor, 9:106

There are four major cities on Cos, of which Telnus is the largest. The others are Selnar, Temos and Jad.
---Raiders of Gor, 13:174