The atlas
About the database
Every answer is checked against a real geographic database, not a word list.
What is in it
The atlas ships with about 119,000 places: every country with its common aliases, every town and city on Earth above roughly one thousand people from the GeoNames dataset, and a curated set of lakes, rivers, mountain ranges, seas, gulfs and straits. Each entry carries coordinates, population where it applies, and the rarity band that drives scoring.
Live lookups
When you play a place the atlas does not know, GeoChain checks live sources before rejecting you: the Wikipedia knowledge base and the GeoNames geographic service. If the place is real and matches the arena, it is accepted on the spot, scored as rare, and cached into the atlas so the next lookup is instant. The database gets deeper every time someone plays something obscure.
On the map
Every accepted place can be viewed on a live map through OpenStreetMap, the same way you would inspect a round in other geography games. Learn more links open the matching Wikipedia article.
Help it grow
Know a real place that gets rejected? Send it in with a verifiable source and a human reviews every submission before it joins the game. Approved places are playable by everyone.