$SUI A caldera is a large, basin-like depression that forms when a volcano erupts and collapses. Unlike a typical volcanic crater, calderas are much larger, often several kilometers wide. They result from the emptying of a magma chamber beneath the volcano, which causes the ground above to sink. Calderas can form suddenly during explosive eruptions or gradually over time. Famous examples include Yellowstone Caldera in the USA and Crater Lake in Oregon. Over time, calderas may fill with water, forming lakes, or experience renewed volcanic activity. These geological features offer insights into Earth's internal processes and past eruptions. Calderas also attract scientists, tourists, and photographers due to their immense size, scenic beauty, and volcanic significance.