The Nyaminyami is a Zimbabwe

Zimbabwe

Zimbabwe is a landlocked country located in the southern part of the African continent, between the Zambezi and Limpopo rivers. It is bordered by South Africa to the south, Botswana to the southwest, Zambia and a tip of Namibia to the northwest and Mozambique to the east. Zimbabwe has three...

an legendary creature believed in by the Tonga people

Tonga people of Zambia and Zimbabwe

The Tonga people of Zambia and Zimbabwe are a Bantu ethnic group of southern Zambia and neighbouring northern Zimbabwe, and to a lesser extent, in Mozambique. They are related to the Batoka who are part of the Tokaleya people in the same area, and also to the Tonga people of Malawi...

. The Nyaminyami is a dragon like creature with a snake's torso and the head of a fish.

The Nyaminyami is said to reside in the Zambezi River and control the life in and on the river. The spirits of Nyaminyami and his wife residing in the Kariba Gorge are God and Goddess of the underworld. Over the years there have been several sightings of the Nyaminyami by local people but there has never been an official, recorded sighting of the creature.
Although there are several different legends surrounding the Nyaminyami the Kariba legend is the most documented and widely known fable.

The Kariba Legend
"The BaTonga People lived in the Zambezi Valley for centuries in peaceful seclusion and with little contact with the outside world.