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.
Signs of and solutions to the world's water crisis.
Photo Tip of the Week
Natural Framing
Door frames, clouds, flowers—anything you see in your image can help to naturally frame your subject and create a strong visual center in your photo.