The Firemoth archipelago consists of three small islands and one medium-sized island. The three little islands have small rock formations that were likely broke off the main island and small beaches all throughout the islands. The southernmost island is the largest formation of the islets, and many people inhabit Fort Firemoth, the only building on the archipelago. The Fort itself small and it has caverns on the western edge of the island. The island east of it serves as a gateway into the Fort. The closest settlement to Firemoth is Seyda Neen on Vvardenfell and Fort Virak on the Mainland in Stonefalls.
During the Interregnum in 2E 583, the island was inhabited by Dunmeri slavers who disregarded the Ebonheart Pact Alliance and the House Hlaalu Government in Seyda Neen. A member of the Morag Tong known as Naryu Virian was sent to Firemoth to assassinate the Captain of the Slavers, Captain Svadstar. She and an unnamed slave subsequently started a slave revolt on the island with the help of the Hlaalu Guard coming from Seyda Neen. Svadstar was assassinated by Virian on his ship while the Hlaalu Navy barraged their ship with siege weapons.
In 3E 414, the Vvardenfell Territory along with surrounding islands such as Firemoth, Sheogorad, and the islands of the Zafirbel Bay became an Imperial Provincial District under the Septim Empire. While various settlements were being built on Vvardenfell, the Imperial Legion built a fort on the main island, the fort was known as Fort Firemoth, and it guarded the Inner Sea. It was eventually taken by Grurn and his undead army. A group of warriors was hired in 3E 427 to clean out Grurn's undead army from Firemoth and to retrieve the Ward of Akavir from the inner catacombs. In the end, the shield was recovered and Grurn was defeated.