Where do periodical cicadas emerge in massive synchronized broods?

Periodical cicadas are found in the eastern United States, where specific broods emerge in highly synchronized events. The best-known cycles are 13-year and 17-year life cycles, making them among the longest-lived insect cycles known. Nymphs spend years underground feeding on plant roots before emerging nearly all at once. Their huge numbers can overwhelm predators and fill forests and suburbs with loud mating calls. Brood patterns vary by region, and some broods are more widespread than others.