The greater Tokyo area — with its current population of 35.7 million — is expected to maintain its No. 1 slot as the most populated urban area, according to the latest U.N. report released Tuesday.

"In 2025, Tokyo is still expected to be the world's most populous urban agglomeration, with 36 million inhabitants," according to "2007 Revisions of World Urbanization Prospects."

The report projects the total urban and rural populations around the globe every two years.