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This article is for the Jacinto Plateau region. For the city, see Jacinto City, for the multiplayer map, see Jacinto (map).

The Jacinto Plateau is a physiographic region of a granite plateau, roughly placed on the coastal area of Tyrus. The plateau was semi-resistant to Locust Horde digging, and as such was one of the few remaining places of human civilization during the Locust War.

Many cities, including Ephyra and Jacinto City, were built upon the plateau. After the passing of the Fortification Act, these cities were transformed into military fortresses, while the remaining sections of Sera outside the plateau were destroyed to prevent them from being used by the Locust. Several portions of the plateau were sunk in 14 A.E., and the plateau was finally evacuated during the final moments of Operation: Hollow Storm.[1]

The COG returned to the Jacinto Plateau in 17 A.E., following the end of the Locust War and Lambent Pandemic. The Jacinto Plateau, which was considered geologically unstable, was stabilized by the ingenuity of Damon Baird and his technology of DB Industries. The COG, with the assistance of automation such as the DeeBees and Fabricator, began to rebuild by recycling materials from the ruined cities. Ephyra was rebuilt as New Ephyra and other cities were used to build COG Settlements on the Jacinto Plateau.


Locust War[]

"Jacinto's the one place they can't dig through..."
—Sgt. Marcus Fenix to Pvt. Benjamine Carmine.

Other than a geological curiosity, the Jacinto Plateau was not prevalent to discussion until the Locust War. When the Locust launched their initial assault on Emergence Day, all major cities on Sera were attacked. Cities on the Jacinto Plateau were attacked, due to natural fissures and tunnels for sewage and subways, the cities on the plateau were easily managed and secured after the emergence.

Jacinto Plateau was one of the only places in Sera where the Locust Horde could not penetrate the ground with Corpsers and digging machines, though when the Locust did break through the granite substrata of Jacinto Plateau, the COG flooded these openings with nerve gas or sealed them. The surviving military leaders had reinforced what had once been Sera's most beautiful cities. The cities of Jacinto and Ephyra were especially safe given the majority of granite underneath and the fact that the two cities were on the edge of the ocean, and were transformed into impenetrable fortresses and securing their control with the Fortification Act.


The human leaders knew that it was only a matter of time before Corpsers broke through the Plateau. They were proven right when the Locust emerged through the granite some ten years after Emergence Day. Jacinto Plateau was then made into yet another battlefield. Only some areas were penetrated, such as the city of Ephyra. Mankind dug in and held their position while the Lightmass Bomb was developed.

Jacinto was once the only place on Sera the Locust could not penetrate. It offered the Humans of Sera respite and safe haven from their relentless foe. However, the city of Ephyra was penetrated over the ten years after Emergence Day. After the Lightmass Bomb was activated, new cracks opened up in the granite layer, allowing deeper Locust incursions. The Locust later sank the near-Plateau cities of Tollen and Montevado very quickly. It was later discovered that this was accomplished through the use of a gargantuan worm-like creature, known as the Riftworm, that had been awakened by the Lightmass Bomb.


The last hours of Jacinto.

As part of a plan to destroy the Locust Horde, the COG decided to sink the plateau's namesake city in order to flood the Hollow and kill off the Horde.

Originally, they intended to do this with another Lightmass Bomb, but they had to improvise and use a Lambent Brumak. The plan succeeded and Jacinto City was sunk, flooding the Hollow and apparently killing millions of the Locust Horde. It was later revealed that not all of the Locust were wiped out, but they were left severely weakened.

Later, while searching for places to evacuate the COG to, the search team did a fly-over of Jacinto City and found nothing left above ground level except the remnants of a few rail lines.

Interwar Period[]

Rebuilding Civilization[]

Following the end of the Locust War and the Lambent Pandemic, the newly-restored COG returned to the now geologically unstable Jacinto Plateau to rebuild their civilization. Rather than settling in the ruins of the old cities on the plateau, the new COG began creating Settlements. The capital of the new COG was New Ephyra, built on the outskirts of the ruins of Ephyra, the old COG's original capital. The COG spent 25 years rebuilding human civilization in a period of relative peace and prosperity.

Swarm War[]

A New Threat Emerges[]

During the Swarm War, the plateau and its cities came under threat once again, this time from the Swarm, the creatures that the Locust had evolved into over the course of twenty-five years.

Battle of Old Ephyra[]

Things came to a head when the Swarm launched a massive attack on Old Ephyra and through it New Ephyra. As part of the attack, a massive Swarm creature called the Kraken was used. The attack was ultimately repelled when JACK sacrificed himself to use the Hammer of Dawn to destroy the Kraken and much of Old Ephyra in the process.

Cities on the Plateau[]


  1. Gears of War 2 Ending Cinematic