Cybertronian Mountains

There is nothing to see in the elephant graveyard. End of story.

Located somewhere beyond Iacon, the Cybertronian Mountains are very literally named: a mass graveyard of Titans, who chose to "go immersant" at the end of their long, long lives, their crumbling, jumbled remains have now fused with the planet's natural geography to become a massive mountain range.

Fiction

2019 IDW continuity

While on his first trip into the Cybertronian wilderness, Rubble climbed up one of the many Titans to get a better look at the Cybertronian sunset. The World In Your Eyes Part One

Some time later, Ruckus and his group of Ascenticon Risers barricaded themselves in one of the Titans during a standoff with Security Operations. Although Cybertron's Reversionist faction viewed the place as a holy site, Soundwave nevertheless was forced to detonate the Titan in question in order to silence Ruckus and his fellow goons. The Change In Your Nature Part One

When the Autobots lost Iacon, they evacuated through the Cybertronian Mountains. Climbing up one of the Titans, Optimus Prime cast one last look at the city to mark what had been lost. We Are Not Meant To Be Darkness

Notes

• The Cybertronian Mountains have not yet been named as-such in universe. The name comes from the retailer incentive cover from issue #8.