Brunei has the second-highest Human Development Index among the Southeast Asian nations, after Singapore, and is classified as a "developed country". It has developed wealth from extensive petroleum and natural gas fields.
It is named after Omar Ali Saifuddien III, the 28th Sultan of Brunei, who initiated its construction. The mosque serves as a symbol of the Islamic faith in Brunei. The mosque's most recognizable feature, the main dome, is covered in pure gold.