Kalis
The war between the Autobots and Decepticons consumed the city, in common with the rest of Cybertron over the millions of years of the conflict. Vast numbers of dead bodies seem to have been left untended in the city, and the city itself is more or less a ruin.
There were two significant things about the city that made it worthy of note.
The first was that the city was positioned directly above a massive fusion reactor and propulsion engines that were the first stage of Megatron's plan to rework Cybertron into a travelling battlestation and thus conquer the universe. The reactor's engines, if ever activated, would have destroyed Kalis.
The second was that the Autobot resistance on Cybertron, led by Emirate Xaaron, chose Kalis as the site for Autobase in the year 1987, after the failure of Operation: Volcano and the death of Impactor.

These two aspects intertwined when the rogue Autobot scientist Flame attempted to rebuild and restart the reactor and the engines, using reanimated robot corpses as his guards. Only the combined efforts of the Wreckers, Ultra Magnus and the dead Impactor prevented the catastrophe.
Kalis bordered the Decepticon region of Tyrest, and also contained a large-scale radio transmitter called the Baird Beaming Facility.
Trivia
- Kalis may be named after the Indian goddess of death, Kali, given the thrust of the Marvel UK story was dead corpses walking around.

