Terpano
Original illustration

Tufa Tower Shore

Eastern California Basin

Tufa Tower Shore — original illustration of Eastern California Basin

Tufa Tower Shore is an original illustration set in Eastern California Basin. It lies in mid-latitudes, where the climate is cold desert — arid, with freezing winters.

Irregular porous cream-grey towers rise from the shore and out of shallow water. White alkaline crust bands mark where the shoreline used to be. The lake sits mirror-blue and flat, and sparse rabbitbrush grows on gravel. Dry mountains stand far behind under a cold clear sky.

Why do these limestone towers form underwater?

Tufa forms underwater, where calcium-rich springs meet carbonate-rich lake water and precipitate limestone around the vent. So towers standing in open air are not a formation — they are evidence that the lake was once much deeper. The crust bands date the retreat. An alkaline lake with no outlet, ringed by dry mountains, marks a closed basin in a cold high desert.

Terpano is a free daily geography puzzle. You study one original illustration, place a pin on a borderless terrain map, and see how close you were. There is no account and no sign-up; progress stays in your own browser. It plays in 11 languages.

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