A megalopolis is a large urban area that consists of several interconnected cities and towns, often stretching over hundreds of miles. These regions typically have a high population density and significant economic activity. Examples of megalopolises include the Northeast Corridor in the United States, which connects cities like Boston, New York City, and Washington, D.C.. Megalopolises often face challenges such as traffic congestion, pollution, and the need for efficient public services. They can also foster cultural diversity and innovation due to the concentration of people and resources. Urban planning is crucial in managing the growth and sustainability of these vast metropolitan regions.