The State of Sierra (Castellanese: Estado de Sierra) is a state is the western Federal States. It is one of the largest states in terms of area, but more sparsely populated. The state is known for its landscape consisting of the Sierras, wide, open high plains and plateaus, desert areas and rivers. It borders Tauhon in the west, Clamash to the south, Riopoderos and to the southeast, Apawiland.
Sierra was first settled around the year 800, had vibrant Native Archantan cultures, settlements and even some cities by 1000-1200. Sierra was explored by the Castellanese from around 1530, though primarily from 1650 onward. The first settlements sprang up around the rivers, primarily in the west. Sierra became a possession of the FSA from 1841, and a territory in 1858. Statehood was achieved in April 1872.