Question: What is the name of the waterfall in the country where the Bubye River is found?

full_context: Document 1: Mtetengwe River: The Mtetengwe River is a tributary of the Mzingwane River in Beitbridge District, Zimbabwe. There are two dams on its tributaries: Tongwe Dam on the Tongwe River, which provides water for an irrigation scheme, and Giraffe Dam which supplies water for cattle.
Document 2: Shashe River: The Shashe River (or Shashi River) is a major left-bank tributary of the Limpopo River in Zimbabwe. It rises northwest of Francistown, Botswana and flows into the Limpopo River where Botswana, Zimbabwe and South Africa meet.
Document 3: Victoria Falls: 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 has been described by CNN as one of the Seven Natural Wonders of the world.
Document 4: Umchabezi River: The Umchabezi River is a tributary of the Mzingwane River in Beitbridge District and Gwanda District, Zimbabwe. The main dam on the river is Makado Dam, which supplies water for commercial irrigation.
Document 5: Bubye River: The Bubye River, also known as Bubi River, is a tributary of the Limpopo River in Beitbridge District and Gwanda District, Zimbabwe. It rises about to the northeast of West Nicholson in Matabeleland South, from where it flows southeast before joining the Limpopo about west of the border with Mozambique. Its course forms part of the border between Mberengwa and Mwenezi districts.
Document 6: Victoria Falls: 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.
Document 7: Nyambwezi Falls: Nyambwezi Falls are a waterfall located in the North-Western Province of Zambia. They are approximately high. Close to the lip of the falls, there is a rock shelter, which has petroglyphs and other evidence of late Stone Age occupation.
Document 8: Cachoeira da Fumaça: The Cachoeira da Fumaça ("Smoke Falls", also known as "Glass Falls") is 340 m tall waterfall in Bahia, Brazil. It was believed to be the country's highest waterfall until the 353 m tall Cachoeira do Araca (Cachoeira do El Dorado) was recently discovered in the Amazon.
Document 9: Thuli River: The Thuli River, former name Tuli River, is a major tributary of the Shashe River in Zimbabwe. It rises near Matopo Mission, Matobo District, and flows into the Shashe River near Tuli village.
Document 10: Niagara Falls: Located on the Niagara River, which drains Lake Erie into Lake Ontario, the combined falls form the highest flow rate of any waterfall in the world that has a vertical drop of more than 165 feet (50 m). Horseshoe Falls is the most powerful waterfall in North America, as measured by flow rate. The falls are 17 miles (27 km) north - northwest of Buffalo, New York, and 75 miles (121 km) south - southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York.
Document 11: Niagara Falls: Niagara Falls is the collective name for three waterfalls that straddle the international border between the Canadian province of Ontario and the American state of New York. They form the southern end of the Niagara Gorge.
Document 12: Chavuma: Chavuma is a town in North Western Zambia, lying immediately south of the border with Angola. The town is approximately 1,100 kilometers from Lusaka and 11 kilometers from the Angolan border town of Kalipande. It lies on the Zambezi River and the M8 road. Local attractions include the Chavuma Falls, while a market takes place on the border, permitting people from both nations to trade.
Document 13: Berlin Falls: The Berlin Falls is a waterfall in Mpumalanga, South Africa. They are located close to God's Window and the highest waterfall in South Africa's Mpumalanga province, Lisbon Falls. Whilst less than a tenth of the heigh of South Africa's tallest waterfall, the Tugela Falls, they are nonetheless extremely beautiful.
Document 14: Chiredzi River: The Chiredzi River is a river in southeastern Zimbabwe. It is a tributary of the Runde River, and is dammed at Manjirenji Dam, which is recognised as an important wetland.
Document 15: Kwe Kwe River: Kwe Kwe River is a small river that runs by the town of Kwekwe in Zimbabwe. It is a lesser tributary of the Sebakwe River and it joins the Sebakwe River north of the town. The water from the river is used by the steel industry that forms the backbone of the town of Kwekwe. The Sebakwe River is a tributary of the mighty Zambezi River.
ground_truth: Victoria Falls
sub_queries: Bubye River >> country Answer: Zimbabwe
what is the name of the waterfall in Zimbabwe Answer: Victoria Falls