6. Seoul/Incheon, South Korea
Population: 17,500,000
Land area: 1,049 sqKm
Population density: 16,700 people per sqKm

Sean Pavone/Shutterstock.com
Population: 17,500,000
Land area: 1,049 sqKm
Population density: 16,700 people per sqKm
Sean Pavone/Shutterstock.com