Asperiche Island (location) independant island south of Teletus and Tabor, administered by merchants.

Asperiche, incidentally, is an exchange island, or free island, in Thassa. It is south of Teletus and Tabor. It is administered by merchants. 
Book 20, Players: pg 129
From Lydius goods may be embarked for the islands of Thassa, such as Teletus, Hulneth and Asperiche, even Cos and Tyros.... 
Book 7, Captive: pg 59