The leopard 'cub' is actually a serval, a completely different species.
Harare is the capital of Zimbabwe, not a city in Zambia.
The team travel from Zambia to Harare, Zimbabwe for medical help. If they were close to the Zambezi river, the closest Zimbabwean hospital would likely be Kariba General Hospital. Harare is on the other side of the country, closer to Mozambique.