The correct answer is - Megalopolis.
The process of urbanization has been an ever-growing one, especially since the Industrial Revolution appeared on the scene. More and more people have been abandoning the life in the rural areas in order to move in, work, and live in the cities.
The cities grew quickly, and as they were constantly having new people coming in, they started to expand and urbanize the surrounding area. Little by little that led to the creating of whole chains of urbanized space that is connected, stretching for hundreds or even thousands of kilometers. This type of interconnected urban areas are called megalopolises, and they are constantly growing, having more and more of the global population located in them.