From Halopedia, the Halo wiki
Unified Earth Government
Escala III is human colony world located among the Outer Colonies, in the Escala system. The planet's capital is Castiglione.
The planet appears to have been left unscathed throughout the Human-Covenant War. In 2558, Captain Thomas Lasky and Spartan Naiya Ray arrived on Escala III in search of the journalist, Petra Janecek.