Village across the Kilghard Hills from Armida; site of Castle Hastur. The name is also given to the sur­rounding district.

The name is casta (adjective in form) fr. Caer "castle, fortress" + cogag "crevice" (small valley). It is coinci-dentally found in an archaic Terran fantasy poem about a planet of a twin-sun system, ascribed to one Robert W. Chambers.

A sept of the Hastur family was called "Hastur of Carcosa."

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