Victoria Falls a visa each time they cross the border; visas can be obtained at both border posts. Costs vary from US$50–$80 (). Visa regulations change frequently; visitors are advised to check the rules currently in effect in both countries before crossing the border in either direction. Additionally, foreign tourists may purchase a KAZA visa for US$50 that will permit visitors to travel between Zambia and Zimbabwe for up to 30 days as long as they remain within the covered countries. A famous feature is the naturally formed "Armchair" (now sometimes called "Devil's Pool"), near the edge of the falls on Livingstone
Victoria Falls of kilometres in all directions. The falls are formed as the full width of the river plummets in a single vertical drop into a transverse chasm wide, carved by its waters along a fracture zone in the basalt plateau. The depth of the chasm, called the First Gorge, varies from at its western end to in the centre. The only outlet to the First Gorge is a wide gap about two-thirds of the way across the width of the falls from the western end. The whole volume of the river pours into the Victoria Falls gorges from this narrow cleft.