Feithera is a hidden city located in Greenland.
It is populated by the winged Feitheran bird-people and is the birth place of former Infinity, Inc. member Northwind. Northwind's grandfather, Worla, was the spiritual leader of the Feitheran race before being succeeded by Northwind. In recent years, Feithera was destroyed (twice, the Feitherans rebuilding it elsewhere as 'New Feithera' the first time!) and its people, having evolved into a new and more avian form, have moved to Khandaq.