12,012 square kilometers

Photo from Wikimedia Commons
Paris (Ile-de-France)
The City of Light and its surrounding region/Cities & Urban
The Paris metropolitan area (Ile-de-France region) covers about 12,012 square kilometers and is home to approximately 12.2 million people, making it the most populous metro area in the European Union. The city proper (Paris intra-muros) is remarkably compact at just 105 square kilometers, bounded by the Boulevard Peripherique ring road. Paris contains some of the world's most visited landmarks including the Eiffel Tower (330 m), the Louvre, Notre-Dame, and the Arc de Triomphe, drawing over 30 million international tourists annually.
Measurements
105 km2 within the Peripherique
Ring road around Paris proper
226 km, 16 lines
Including antenna
Famous boulevard