The Great Rear Wall can be seen as a grey circle in this view looking along the length of the Centauri Princess' interior [Image: A Ahad]

The Great Front Wall and the Great Rear Wall are two circular areas of the starship that mark the ends of its cylindrical biosphere on either end.

Each wall has a diameter and height, stretching from floor to ceiling, of roughly six miles.

The two Great Walls are engineering megastructures that have bare and relatively smooth surfaces, are grey in color, and made up of a mixture of concrete and metal to give them a robust architecture. Neither wall is inhabited by people or vegetation, since they lie perpendicular to the spin-axis of the Centauri Princess and therefore experience conditions of zero or microgravity.

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