🌐EnglishEnglishFrançaisItalianoNederlandsРусский日本語EntityQ7857570· pop 7· linked from 53 articlesTwelve-Mile Circlearc-shaped boundary between the U.S. states of Pennsylvania and DelawareConnectionsUnited StatesCountryPennsylvaniaEntityCategoriesBorder irregularities of the United StatesBorders of DelawareBorders of MarylandBorders of New JerseyBorders of PennsylvaniaGeography of Cecil County, MarylandGeography of Chester County, PennsylvaniaGeography of Delaware County, PennsylvaniaGeography of MarylandGeography of New Castle County, DelawareGeography of Salem County, New Jersey