Mosi-oa-Tunya National Park Mosi-oa-Tunya National Park Mosi-oa-Tunya National Park (Sotho: "Musi oa Thunya" [Mosi wa Tunya] ""The Smoke Which Thunders""), is an UNESCO World Heritage site that is home to one half of the Mosi-oa-Tunya "— 'The Smoke Which Thunders' —" known worldwide as Victoria Falls on the Zambezi River. The river forms the border between Zambia and Zimbabwe, so the falls are shared by the two countries, and the park is 'twin' to the Victoria Falls National Park on the Zimbabwean side. ‘Mosi-oa-Tunya’ comes from the Kololo or Lozi language and the name is now used throughout Zambia, and in parts of
Victoria Falls line and abandonment of the earlier line. North-south oriented joints control the south flowing sections of the river. One of these is the "Boiling Pot", which links the First Gorge with the Second Gorge. The falls may have already started cutting back the next major gorge, at the dip in one side of the "Devil's Cataract", between the western river bank and Cataract Island. The lip in the current falls is lowest here and carries the greatest concentration of water at flood stage. The sedimentary sequence overlying the basalt at the Zambezi River margins is called the Victoria Falls Formation,