722 hectares total

Photo from Wikimedia Commons
Great Zimbabwe
The largest stone ruins in Africa south of the Sahara/World Landmarks
Great Zimbabwe is a ruined city in southeastern Zimbabwe that was the capital of the Kingdom of Zimbabwe during the country's Late Iron Age (11th-15th century). The Great Enclosure, the most iconic structure, has walls up to 11 m high and 5 m thick, built entirely of granite blocks without mortar. The complex covers about 722 hectares and once housed up to 18,000 people. The word 'Zimbabwe' derives from the Shona dzimba-dza-mabwe, meaning 'houses of stone.' The ruins give the modern nation its name.
Measurements
Outer wall perimeter
Maximum height
At the base, tapering upward
Solid stone cone inside the enclosure
Above surrounding terrain