Canonical
The Emerald City is surrounded by a high, thick, bright-green wall.
The green capital at the center of Oz, reached in the first book by the Yellow Brick Road and containing the ruler's palace.
The Emerald City is surrounded by a high, thick, bright-green wall.
The approach ends at a large gate studded with emeralds.
The Palace of Oz stands in the middle of the City.
Visitors are fitted with locked green spectacles at the gate in the first book.