Cenote Light Shaft

Cenote Light Shaft is an original illustration set in Yucatán Peninsula, Mexico. It lies in the tropics, where the climate is tropical savanna — a pronounced dry season.

One clean vertical shaft of sunlight drops through a round skylight into clear water, ending in a bright ellipse below the surface. A curtain of vines and long roots hangs from the rim. The cave walls are pale limestone, and the water is still and cool.

Why does a cenote open as a near-perfect circle?

A cenote is a collapsed cave roof: rainwater dissolves porous limestone from beneath until the ceiling gives way, opening a circular skylight. It happens across a whole region only where the bedrock is thick limestone with no surface rivers — all the drainage is underground. Roots reaching down from the rim are trees drinking from the only water available.

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.