In "The Matrix" trilogy, the last human city is called Zion.
Zion is a vast underground city built deep beneath the ruined surface of Earth. It shelters humans who have rejected the Matrix and live disconnected from the machines’ simulated world. Because the machine war has devastated the planet’s surface, Zion’s location near Earth’s core provides warmth and helps sustain the surviving population.
The city is more than a refuge: it is the center of human resistance. Its defense depends on hovercraft fleets, infantry, and soldiers operating powered battle suits. In "The Matrix Reloaded," the Architect reveals that Zion has a complicated relationship with the machine system. The machines allow rejected humans to gather there, then periodically destroy the city as part of their effort to control instability caused by human choice.
Elysium and Eden are names associated with other religious or fictional ideas, not the canonical city in the trilogy. Nova is also not the city’s name. The name Zion carries biblical associations, particularly with Jerusalem, adding symbolic weight to the resistance’s last stronghold.