Though the northern hemisphere of Enceladus is pockmarked with impact craters, the southern hemisphere (especially near the pole) is almost entirely crater-free. Instead, this region is carpeted with countless house-sized ice boulders, as well as long, winding crevasses known as “tiger stripes.” From these relatively warm stripes, fissures form and disappear, creating huge geysers of water vapor fueled by a deep, subsurface ocean.