New areas
New craters and zones unlock as you progress — that is the area fact the listing publishes.
Official fact
Source phrase: “Unlock new craters and zones as you progress”
The listing does not name individual craters or publish unlock thresholds. Area progress is tied to overall advancement in the sweep-sell-upgrade loop.
Context
Cleaning a zone is what produces the material you sell, so area progress and gear upgrades feed each other: better gear clears more ground, and new ground funds the next upgrade.
Next steps