The Western sea existed on the world of Abrion Major, and it was a sea. A weapons factory belonging to the Confederacy of Independent Systems was located there, specifically on the main island within a group of islands. The Abrion Bridge provided the sole access to the factory from the other islands, enabling passage to the weapons production facility. Approximately in 22 BBY, amidst the Clone Wars, the Galactic Republic engaged the Separatists in a battle on the bridge and triumphed, managing to seize the schematics for the mega-ion cannon from the manufacturing plant.
The Separatist weapons factory made its initial debut in the third issue of the Star Wars: Obi-Wan comic miniseries, which Marvel Comics released on July 27, 2022.