Cutting across the Zambezi River, bridging the countries of Zambia and Zimbabwe, Victoria Falls is the largest waterfall in the world. In the dry season, this awesome force of nature divides two natural worlds -- the tranquil meandering river above the cascade, and the raging abyss of the gorge below. The upper river is idyllic, running shallow through sandstone hills and meandering around islands and reed-beds where elephants, hippos, and crocodiles thrive. In a single vertical drop the river plummets twice the height of Niagara Falls into the wild waters and heavy spray of the narrow gorge, where fish are found only by those who know where to look. Between the two worlds are treacherous cliffs and thick, mossy rainforests fed by river mists, home to baboons whose lives change with the seasons. When the rains fall, the rivers swell and the falls thunder.