cantrevs, lying in the far, mountainous north of Prydain. They lay west of the Eastern Strongholds and north of the Eagle Mountains, though that range may have been included in the Northern Realms as well. Fflewddur's Kingdom was among them, as was the domain of "old Pen-Llarcau" and possibly the cantrev of King Morgant, called Madoc. The Northern Realms were never visited or seen in the books, only mentioned.
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