Tokyo, Japan, the world’s most populated urban center with over 39 million people

iss073e0918643 (Oct. 18, 2025) --- Tokyo, Japan, and its surrounding suburbs along Tokyo Bay light up the night, with stops along major rail lines glittering like pearls. The Greater Tokyo Area—the world’s most populated urban center with over 39 million people—is pictured at approximately 4 a.m. local time from the International Space Station as it orbited 262 miles above the island nation.