The two top contenders are Angel Falls in Venezuela and Tugela Falls in South Africa, but which one claims the title depends on the criteria. The debate is whether to award the title to the tallest single drop or to the tallest sequence of falls. Angel Falls easily wins the tallest drop contest with a breathtaking 807-metre (2,648-foot) cascade. But Tugela Falls is a series of five falls in quick succession, which taken together drop a total 948 metres (3,110 feet). When Angel Falls was originally measured in 1949, the American expedition included a second 30-metre (98-foot) plunge farther downstream. If you include the sloping rapids between these two falls, the total drop in elevation is 979 metres (3,212 feet).
Answered by Dave Roos