The most compelling geographic clue supporting a northern land bridge sits on the opposite side of the globe. Far to the east of the Free Cities, guarding the Golden Empire of Yi Ti from the Bleeding Sea and the dry plains of the Grey Waste, stand the Five Forts of Yi Ti. These towering structures, each built from slabs of fused black stone nearly 1,000 feet high, dwarf even the Wall built by Brandon the Builder.
According to ancient Yi Tish legend, the Pearl Emperor erected the forts during the Long Night to defend against demons that marched from the frozen northeastern wastes. This timeline aligns perfectly with the Westerosi Long Night, when the Others emerged from the deep north. If Essos and Westeros are separated by thousands of leagues of impassable sea, the sudden, simultaneous invasion of icy horrors on two disparate continents presents a logistical puzzle. If, however, the Lands of Always Winter extend continuously over the pole to touch northern Essos, the White Walkers origin theory expands into a single, unified polar threat encircling the planet.
| Geographic Feature | Structural Dimensions | Mythic Adversary | Strategic Purpose |
|---|---|---|---|
| The Wall (Westeros) | 700 feet high, 300 miles long, compacted ice and stone | The Others (White Walkers) | Bar polar incursions into southern kingdoms |
| Five Forts (Yi Ti) | 1,000 feet high, fused black stone, garrisons 10,000 men each | Lion of Night demons | Seal eastern frontier against northern horrors |
| The Arm of Dorne (Historical) | Shattered land bridge, now the Stepstones archipelago | First Men migrations | Former physical terrestrial transit between continents |
