Densely populated refers to an area with a high number of people relative to the available land size.
Related terms
Population Density: The average number of people living within a specific area (often measured per square mile or kilometer).
Megacity: A city with a population exceeding 10 million inhabitants.
Urban Sprawl: The unplanned expansion of urban areas into surrounding rural lands, often resulting in low population density in some areas and increased commuting distances.