Greywater Watch is located deep within the swamps and mires of the Neck. It is the southern-most stronghold of the North and the principal fortress of the diminutive crannogmen who live on the Neck. Greywater Watch is the seat of House Reed and is located upon one of the strange floating islands of the Neck. It is impossible for outlanders to find Greywater Watch because it literally moves. Several armies of the River Kings and later the Freys have attempted to conquer Greywater, but none could find it.