Nuon City

Nuon City is, or was, a city on Cybertron.

Underbite ate it.

Fiction

2015 Robots in Disguise cartoon

According to Underbite, the reason you can't go to Nuon City anymore is because he ate it. Pilot (Part 1) Grimlock used this fact to his advantage when Simacore challenged him with a unirail question. Brainpower

Ask Vector Prime

In ancient times, the Cannibal Baron ruled an empire that stretched from his seat of power in Corumkan to as far south as Nuon and as far north as Harmonex. Ask Vector Prime, 2015/09/15

Beast Wars: Uprising

The southern city of Nuon bordered the much larger Protihex. Safe Spaces Airazor was from Nuon. Derailment Nuon fell to the Resistance during the Grand Uprising, Safe Spaces but was later overrun and destroyed by Vehicons. Derailment