Consider the question. Victoria Falls (Tokaleya Tonga: Mosi-oa-Tunya, "The Smoke that Thunders") is a waterfall in southern Africa on the Zambezi River at the border between Zambia and Zimbabwe. It is clearly visible from the Zimbabwean side, which also has the town Victoria Falls named after the falls.

Answer this question based on the passage: where does the water come from that goes over victoria falls?
 What is the step-by-step reasoning process to arrive at the answer: the Zambezi River?
The important part for answering this question is: Victoria Falls (Tokaleya Tonga: Mosi-oa-Tunya, "The Smoke that Thunders") is a waterfall in southern Africa on the Zambezi River at the border between Zambia and Zimbabwe.