Isobath — the daily place-it-on-the-map game

Isobath is a free daily geography game. Each day it gives you five real cities, one at a time, on a blank world map — and instead of naming them, you place them: tap where you think the city is, adjust the pin, confirm. The map then answers with an arc drawn from your pin to the truth and a distance: off by 412 km. Five rounds add up to a total, a percentile and a streak, in about two minutes.

The map is drawn from public-domain Natural Earth coastline data in our own palette. There is no Street View, no satellite imagery and no third-party map tiles, so Isobath loads on throttled connections and on school or office networks that block imagery hosts. It shows coastlines only — no borders, no country labels, no flags.

Everyone in the world gets the same five cities each UTC day. Nothing you do is uploaded: your streak lives in your own browser. Free, no account, no install.

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