The Westerlands is one of the regions in the fictional world of Westeros, created by author George R.R. Martin in his series, "A Song of Ice and Fire." It is known for its rich gold mines, which have historically made it one of the wealthiest areas in the realm. The Lannisters, a prominent noble family, rule this region from their seat at Casterly Rock. The landscape of the Westerlands features rolling hills, fertile valleys, and a temperate climate, making it suitable for agriculture. The region is bordered by the Reach to the south and the Riverlands to the east. Its strategic location and resources have made it a significant player in the political dynamics of Westeros.