When two separate towns grow and merge into, the one new settlement formed is called a

When two separate towns grow and expand to the point where they merge together, they form a new settlement that is called a conurbation. A conurbation is a large urban area comprising several towns or cities that have grown together and become one continuous built-up area. This often happens as a result of urbanization, where people migrate from rural areas to urban centers in search of better economic opportunities and a higher standard of living. As more and more people move into these urban areas, the separate towns begin to grow and expand until they eventually merge into one large conurbation.