National Geographic News

Travertine Chimneys, Djibouti

Photograph by Carsten Peter

Travertine chimneys near Lake Abbe, Djibouti, were created by hot springs depositing calcium carbonate—the same process that creates stalactites and stalagmites. Some of the formations reach 165 feet (50 meters) near the lake located on the Ethiopia-Djibouti border.

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