Vital to the survival of many species, waterholes draw large concentrations of animals seeking to quench their thirst. But these wildlife hotspots are anything but peaceful oases — where there is water, Africa’s deadliest are often nearby. From Nile crocodiles waiting beneath the surface for their parched prey to come to them to violent territorial disputes between giant hippo bulls, Africa’s waterholes set the stage for some of the continent’s greatest spectacles.