"Mohenjo-daro, whose population has been estimated at 40,000 to 50,000, was probably the most extensive city; its total area, a fifth of which has been excavated, is generally stated to be between 150 and 200 ha (hectares), although the German archaeologist Michael Jansen, who conducted a detailed research on the city’s urbanism, leans towards 300 ha,17 which would make it possibly the largest city of the ancient world. Harappa was about half that size."