They were passing between the Elder Kingdoms now, with Bashti on the west bank and Hathir on the east. Thousands of years before, these two colossi had controlled most of the Central Lands; but Hathir had long since disintegrated, and decaying Bashti was a power now in name only.
– Torisen's narration, Dark of the Moon, "Chapter 12: Night Pieces"
At Hathir's height, they held the eastern bank of the Silver, from the Cataracts to the Riverland. In the Riverland, Hathir built many fortresses up and down the river valley as it competed with Bashti. The modern keeps Kithorn, Tagmeth, Mount Alban, Wilden, Falkirr, Gothregor, Omiroth, and Kestrie are built on the sites of these fortresses. Holding the north was always difficult and expensive, and after a large earthquake, both kingdoms ceded the Riverland to the Kencyrath.
↑Seeker's Mask, "Part III: The Riverland", I — "The Silver was the frontier between those two giants of the Central Lands, Bashti and Hathir. At the height of their power, a thousand years ago, they had built rival fortresses up the length of the river from the Cataracts to Kithorn."
↑To Ride a Rathorn, "Chapter XVII: Into the Wilds", II — "the Riverland fortifications had originally come in pairs, built by the ancient kingdoms of Bashti and Hathir to glare at each other across the Silver."
↑Seeker's Mask, "Part IV: Restormir", VIII — " 'river travel in the north ended a thousand years ago, after a great weirdingstrom changed the Silver's course from one end to the other. Back then, there were lots of trade cities on both banks of the Central Lands. […] Whole populations disappeared—drowned, the survivors thought, although no bodies were ever found.' 'Bashti and Hathir never recovered, […] that was when they gave the Riverland to us, because they couldn't bring garrison supplies upriver by barge anymore,"
↑Dark of the Moon, "Chapter 2: The Hell Hunt" — "the paired keeps that faced each other across the Silver at twenty to twenty-five mile intervals down the length of the Riverland, it had been built nearly a thousand years before to guard the northern frontier between the ancient kingdoms of Bashti and Hathir. Both the Riverland and the keeps had eventually been ceded to the Kencyrath so that it might serve as a buffer state here in the far north."