Ophidian

Ophidian was a Silurian city that developed in an alternate timeline created by The Monk where the Doctor was killed in Wenley Moor during the awakening of the Earth Reptiles.

With The Doctor's death, the Silurians and the Sea Devils once more rose from hibernation whereupon they became the dominant species on the planet. Over the next twenty years, they began the slow process of terraforming the world back to its original condition during the Earth Reptiles original rule. This saw the reintroduction of Dinosaurs into the ecosystem and the planet's cities overrun by jungle as well as saw Humankind being driven to the brink of extinction. Once they had completed there work, the Silurians created the new capital city of Earth which was Ophidian and was located in Africa.

In this parallel reality, the Doctor along with Ace and Bernice Summerfield fell onto this version of Earth due to a hole in the Time Vortex. Over the course of events, the Doctor travelled to Ophidian where he met with Morka who had shown regret over his actions and attempted to form a lasting peace with man. However, the vengeful Brigadier Lethbridge-Stewart wanted to destroy the Silurian race and thus saw him unleashing a dinosaur stampede in Ophidian which killed many Silurians after which he launched a Nuclear missile at Ophidian. The Doctor was able to prevent the detonation of the warhead through the use of the TARDIS and saw to it that both Earth Reptile as well as Humans make a new peace. (NA: Blood Heat)