Mirabar is a mining city of great wealth located on the Sword Coast. As of 1368 DR it was the richest city north of Waterdeep. In 1370 DR, the city was occupied by 1600 shield dwarves who lived underground near to their workshops, which produced metal goods for export in the region and beyond. The humans above cooperated with the dwarves to handle the mining, move the ore to market, and defend the city against magical threats.

Mirabar is ruled by a hereditary marchion, but the true power is in an elected assembly called the Council of Sparkling Stones, a mixed dwarven and human group that meets once a year to determine production quotas and whether or not to threaten current clients with reduced output.

On the surface, Mirabar is populated with squat stone buildings and a few stone towers. It is arranged in such a way as to provide great efficiency. Its walls are extremely thick and sloping, so as to allow water to be poured down them in the winter, which freezes to make them slippery. The area around the city is dotted with open mines and heaps of rock. Roads lead to its major mines in the Spine of the World mountains, which yield a wide range of metals and gemstones, so they are guarded against orc and monster raids.

Mirabar is defended by the Axe of Mirabar, a miliatia of around two thousand, including humans and five hundred dwarves. There is virtually no crime, and the city utilizes professional thief trackers, the "Shadow District", to monitor any potential criminals. Making maps of the city is illegal for security purposes, because the city is concerned about intelligence getting into the hands of Mirabar's enemies, especially Luskan. An attack on a councilor or a councilor-elect is punishable by execution. This is to prevent plots to foil a candidate's election campaign.