Star-Nosed Mole Castle is located in a spacious underground cavern. It is surrounded by a moat.
The castle is cragged in appearance, suggesting that it may be made of rock. It consists of a number of rounded sections, with illuminated yellow windows. Toward its top are ramparts, above which are towers. Its door is guarded by a red portcullis.
A brief skirmish was held here when several members of First Squad were abducted by the star-nosed moles. It was cleared up when Star-Nosed Mole King was saved from a falling stalactite by Commander ApeTrully.