The Limpopo river, the second largest river in Africa, flows in a great arc, first zig-zagging north and then north-east, then turning east and finally south-east. Then it serves as a border for about 640 kilometers (398 mi), separating South Africa to the south-east from Botswana to the north-west and Zimbabwe to the north. There are several rapids as the river falls off Southern Africa’s inland escarpment. In fact where the Marico River and the Crocodile River join the name changes to Limpopo River. The waters of the Limpopo flow sluggishly, with considerable silt content. Rainfall is seasonal and unreliable: in dry years, the upper parts of the river flow for 40 days or less.
- Info Wikipedia