Victoria Falls/Mosi-oa-Tunya,/Thundering Smoke is a waterfall on the Zambezi River, located on the border between Zambia and Zimbabwe.  It is one of the world's largest waterfalls. Its region is inhabited by several unique species of plants and animals. In November 1855, David Livingstone was the first European who saw the falls, when he travelled from the upper Zambezi to the mouth of the river between 1852 and 1856. The falls were well known to local tribes, and Voortrekker hunters may have known of them, as may the Arabs under a name equivalent to "the end of the world". Europeans were skeptical of their reports, perhaps thinking that the lack of mountains and valleys on the plateau made a large falls unlikely. Victoria Falls is part of the mighty Zambezi River, which forms the border between Zimbabwe and Zambia.