Which river forms the border between Botswana and Zimbabwe and is known for flooding?

The river that forms the border between Botswana and Zimbabwe and is known for flooding is the Limpopo River. This river flows from its source in South Africa to its mouth at the Indian Ocean, passing through several countries, including Botswana and Zimbabwe.

The Limpopo is characterized by its seasonal flooding, particularly during the rainy season, which can lead to significant changes in the river's flow and surrounding ecosystems. It plays a crucial role in the geography and ecology of the regions it traverses, impacting agriculture and settlements along its banks.

In contrast, the Congo River, while a major river in Africa, does not border Botswana or Zimbabwe. The Zambezi River, although it is known for its strong seasonal flooding and is a notable river in the region, primarily forms the border between Zambia and Zimbabwe, rather than Botswana. The Niger River is located in West Africa and does not have any geographical relation to Botswana or Zimbabwe. Thus, the Limpopo is the correct answer for the border river between Botswana and Zimbabwe, particularly recognized for its flooding tendencies.