4,114 square kilometers total

Photo from Wikimedia Commons
Dubai
The desert city reinvented as a global hub of commerce and spectacle/Cities & Urban
Dubai, one of seven emirates of the UAE, covers about 4,114 square kilometers, though the built-up urban area is a fraction of that. The city has transformed from a modest trading port into one of the world's most ambitious urban experiments, featuring the Burj Khalifa (828 m, the world's tallest building), artificial islands shaped like palm trees, an indoor ski slope, and the world's largest shopping mall. Dubai's population has grown from about 183,000 in 1975 to over 3.5 million, with roughly 85% of residents being expatriates.
Measurements
Approximately 1,500 km2
World's tallest building
Including artificial islands
90 km driverless metro
Artificial palm-shaped island