Original: At its height c 2900 BC, Uruk probably had 50,000 â "80,000 residents living in 6 km2 of walled area; making it the largest city in the world at the time.
Simplified: At its height c 2900 BC, Uruk probably had 50,000 â "80,000 residents living in 6 km2 of walled area; the largest city in the world at the time.