Final answer:
The landlocked country with the Nazinga reserve, protecting the largest elephant population in West Africa, is Burkina Faso.
Step-by-step explanation:
The landlocked country where you would find the Nazinga reserve, protecting the largest elephant population in West Africa, is Burkina Faso. Burkina Faso is located in West Africa and is bordered by six countries, making it completely surrounded by land. The Nazinga reserve covers an area of approximately 96,000 hectares and is home to various wildlife, including a significant number of elephants.