As the U.S. economy grows and morphs, people are finding themselves living not just in cities or suburbs or towns, but also in much larger “megaregions.” Economists, geographers, and planners are only just beginning to understand these highly interconnected areas, the boundaries of which are still being debated.

This intriguing new interactive map attempts to put geographic borders on the country’s megaregions—and names them all as well.

“We hope that people can learn more about how the U.S. looks from a different perspective,” says urban studies scholar Alasdair Rae of the University of Sheffield in England. “We know that political boundaries are important, and lines drawn on maps really do matter. But they often don't reflect the realities of day-