Hydrax Canyons

Located between the Energon lake and Kalis, the Hydrax Canyons were once home to an ancient Autobot city, whose ruins litter the canyon's bottoms. The canyons themselves are crossed by colossal bridges.

Transformers: Fall of Cybertron (Xbox 360/PS3/PC)
Just before the exodus from Cybertron, the Autobots sent a transport tanker full of energon across a bridge over the Hydrax Canyons. The Combaticons Vortex and Blast Off flew through the canyons, avoiding Autobot traps and ambushes, before finally destroying the bridge and diverting the Tanker along a road to Kalis.